ing fairly flat in lateral view in transmitted light and slightly convex in dorsal view (Figure 74b4)\ posterior end of bulge with very small posterior projection on some specimens (Figure 74b4); dorsal and ventral edges of bulge well defined, rib-like on some specimens, forming right angle with apex at posterior end of bulge (Figures 12a,b, 74a).
Ornamentation: Long bristle just medial to tip of postero-
dorsal bulge (Figures 72b, 74b4)- Surface of valves with widely separated dish-like shallow fossae on most specimens (Figure 72b\ and closely spaced minute spines along shell
edges (Figure 72c,e). Long undivided bristles very sparsely distributed on lateral surface of valves, more abundant along anterior and ventral margins, most with broad triangular base (Figure 72c). Minute processes observed on inner side of posterodorsal edge of left valve of USNM 193866; pore canals lead from processes to inside of valve (Figure 71d,f). Outer surface of valves without gel-like coating.
Infold: Anterior infold with small bristle near inner margin
(Figure 72c). Infold anterior to caudal process with several minute bristles near inner edge (Figure 72d,e); infold of caudal process with 3-5 small proximal bristles and 2 small distal bristles (Figure 72d,e)\ infold dorsal to caudal process with 2 setal bristles (Figure 72d).
Central Adductor Muscle Attachments (Figure 72b): Com- prising about 16 individual ovoid attachments.
Carapace Size (mm): Slope 19: length and height 1.60,
1.48. Slope 46: holotype, length and height 1.57, 1.42; USNM 193866, length without caudal process 1.49, length with caudal process 1.56, height 1.45; USNM 193867 (2 specimens), length without caudal process 1.49, length with caudal process 1.51, height 1.45; length and height 1.47, 1.35. Slope 56 (3 specimens): length 1.64, height without caudal process 1.47, height with caudal process 1.60; length and height 1.58, 1.46;
length 1.52, height with caudal process 1.39, height without caudal process 1.32. Length range without caudal process 1.47-1.64. (If a measurement is given above not mentioning caudal process, the caudal process did not extend past valve edge measured.) (Note that in some specimens caudal process extends past valve edge posteriorly and in others ventrally.)
First Antenna (Figure 72g}i): 1st joint long, bare. 2nd
joint with few dorsal spines and spinous dorsal bristle. 3rd and
4th joints fused; 3rd joint with long dorsal bristle and ventral
bristle about half as long, both with few indistinct hairs. 4th
130
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGYFIGURE 72.—Eusarsiella bex, new species, ovigerous female, paratype, USNM 193866: a, complete specimen from left side, length without caudal process 1.49 mm, ov (bulge stippled); b, posterodorsal comer, right valve, ov (bulge stippled; fossae represented by open circles; central adductor muscle attachments represented by fllled-in circles); c. anterior, left valve near midheight, iv (not all marginal bristles shown); d, posterior, left valve, iv; e, caudal process, right valve, iv; / , 3 processes and pore canals (dashed) on inner posterior edge, left valve, iv (detail from d); g, right 1st antenna, Iv (not all bristles shown); h, tip of left 1st antenna, mv (not all bristles shown); i, endopodite and part of protopodite, right 2nd antenna, mv; j , right lamella of fiirca; it, furca (proximal parts of claws 1 and 2 of left lamella and claw 1 or right lamella); /, dorsal part of anterior of body from right side, anterior to right; m, medial eye and proximal part of Bellonci organ from left side, anterior to left (area of brown pigment stippled).
131
FIGURE Th.—Eusarsiella bex. new species, ovigerous female, paratype, USNM 193866: a, left mandible, mv; b, ventral part of basale, right mandible, mv, anterior to left; c, endites, left maxilla, mv; d, left maxilla, mv (endites not shown); e, 5th limb;/, left 6th limb, lv; g, 7th limb; h, posterior of body from left side, anterior to left.
132 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY
FIGURE 74.—Eusarsiella hex. new species, ovigerous female, holorype: a. compiele specimea from left side, length without caudal process 157 mm ov (bulge stippled): b. dorsal view of posterior end of oompieie specimen, anterior to bottom, ov; c, dorsal part of anterior of body from left side, anterior to left. Oviparous female, paratype, USNM 193867: d. dorsal view of posterior of complete specimen, anterior to bottom.
joint with numerous minute dorsal spines, 2 rows of indistinct ventral spines and 3 or 4 bare bristles (2 or 3 ventral, 1 dorsal).
Sensory bristle of 5th joint with 1 minute filament at about '/3 length (Figure 72A). 6th joint fused to 5th, with small spinous medial bristle near dorsal margin. 7th joint (Figure 72A):
a-bristle about twice length of bristle of 6th joint, with short marginal spines; b-bristle slender, bare, about twice length of a-bristle; c-bristle slightly shorter than sensory bristle of 5th joint, with minute filament at about '/3 length. 8th joint: d- and e-bristles slightly shorter than c-bristle, and d-bristle slightly longer than e-bristle, both bare with blunt tips; f- and g-bristles same length as sensory bristle of 5th joint, with minute filament at '/3 to l/i length. Sensory bristle of 5th joint and b-, c-, f-, and g-bristles with minute filament at tip.
Second Antenna: Protopodite bare (Figures 72i. 74c).
Endopodite with 2 slender bare proximal bristles and 1 minute unringed bristle on a small terminal node (Figure 72/).
Exopodite: 1st joint with small terminal medial recurved tubular bristle; bristle of 2nd joint with slender proximal ventral spines and distal natatory hairs; bristles of joints 3-8 with natatory hairs, no spines; 9th joint with 2 bristles (1 short dorsal, bare or with few short hairs, 1 long ventral with natatory hairs).
Mandible (Figure 73aJ>): Coxale endite single stout pectinate; ventral margin of coxale with long slender spines;
longer and slenderer spines on lateral side near ventral margin.
Basale (Figure Thajb): ventral margin with 4-6 short bristles;
dorsal margin with small bristle at midlength and 2 terminal;
133 lateral surface with minute bristle on distal edge near dorsal
margin (?exopodite) (dashed in Figure 73a). 1st endopodial joint with medial spines and spines on distal dorsal comer, ventral claw slender. 2nd endopodial joint with minute indistinct bristle on dorsal margin; ventral claw slender. 3rd endopodial joint with slender terminal claw and 3 minute bristles (2 ventral, 1 dorsal).
Maxilla: Precoxale with dorsal hairs. Coxale with short bare dorsal bristle (Figure 73d). Endite I with 3 pectinate unringed claws and 3 ringed bristles with spines or minute teeth; endite II with 2 pectinate unringed claws and 2 ringed bristles with short spines; endite III with 1 pectinate unringed claw and 5 ringed bristles with marginal spines (Figure 73c).
Basale with short bare bristle near exopodite (Figure 73d).
Exopodite with 3 bristles (I long spinous, 2 shorter bare (one '/2 and other 'A length of long bristle)). 1st endopodial joint with spinous alpha- and beta-bristles. 2nd endopodial joint with 2 lateral spinous a-bristles. 1 medial spinous c-bristle, and 5 pectinate end bristles (middle bristle shorter, anterior bristle ringed distally. other stout unringed claw-like).
Fifth Limb (Figure 73*): Epipodite with 38 plumose bristles. Single endite with small bare bristle. Exopodite: 1st joint with 3 bristles; 2nd joint hirsute, with 4 bristles (1 small);
joints 3-5 fused, with total of 6 bristles (1 small); joints 3-5 could be interpreted as having 1 bristle on outer lobe of 3rd joint and 3 bristles on inner lobe, and 4th plus 5th joints with 2 bristles. (Rings of bristles not shown.)
Sixth limb (Figure 73/): Single endite with 3 bristles (2 medial, 1 longer terminal). End joint with 14 bristles followed by space and 2 long plumose bristles; posterior edge and medial and lateral sides near edge hirsute (not all shown). (Rings of bristles not shown.)
Seventh Limb (Figure 73g): Proximal group with 4 or 5 bristles (2 or 3 on each side), each with 4 bells; terminal group with 6 bristles (3 on each side), each with 2-6 bells. Terminus with opposing combs, each with about 13 alate teeth.
Furca: Each lamella with 5 claws (Figure 72/); claw 1 nonarticulated; claws with long and short teeth along posterior edges; right lamella anterior to left by width of base of claw 1, with row of long hairs just proximal to base of claw 1 and with few indistinct spines along leading edge (Figure 72*); each lamella with numerous spines along margin following claws.
Bellonci Organ (Figure 721/n): Broad proximal part tapering to cylinder with broadly rounded tip.
Eyes: Medial eye bare with scattered brown pigment (Figure 721 jn). Lateral eye smaller than medial eye, with 5 or 6 minute amber-colored cells; small amount of brown pigment in lateral eye of holotype (Figure 74c) and specimen from Slope 56, but not in eye of USNM 193866 (Figure 72/); eye visible through shell of 2 specimens from Slope 56.
Upper Lip: Not examined.
Genitalia (Figure 73h): Small sclerotized ring with at- tached spermatophore on each side of body anterior to furca of USNM 193866.
Anterior of Body (Figure 72/): With small rounded anterior process between medial eye and upper lip.
Posterior of Body (Figure 73A ): Bare.
Y-Sclerite (Figure 73A): Typical for genus.
Number of eggs: Holotype with 2 eggs in marsupium (also 1 female choniostomatid copepod and 6 choniostomatid ovisacs); length of typical egg 0.30 mm; USNM 193866 with 3 eggs in marsupium (1 egg shown inside shell in Figure 72a);
length of typical egg 0.29 mm. USNM 193867 and unnum- bered specimen from Slope 46 with 5 eggs in marsupium.
Specimen from Slope 56 with 6 eggs in marsupium; length of typical egg 0.23 mm.
Parasites: Holotype with 1 female choniostomatid cope- pod and 6 choniostomatid ovisacs in marsupium; range of lengths of 3 choniostomatid ovisacs: 0.30-0.33 mm.
Epizoa: Ovigerous female from slope 56 with small foraminifera cemented to outer surface of right valve near caudal process.
DESCRIPTION OF ADULT MALE (Figure 75).—Carapace more elongate than that of female; anteroventral edge oblique in lateral view (edge of valve shown dashed in Figure 75a). Outer surface without jell-like coating.
Ornamentation: Broad flange-like lateral overhang ex- tending past valve edge; flange broadest along anterior and ventral margins and absent in vicinity of incisur (Figure 75a);
small lateral posterodorsal process extending past valve edge.
Narrow low horizontal rib present in vicinity of central adductor muscle attachments. Long bristles (some with broad bases) along edge of valve and on inner side of marginal flange as well as sparsely distributed on valve surface (some bristles shown in Figure 75a).
Infold: Small bristle at inner edge of anteroventral infold posterior to incisur, infold of caudal process with 5 or 6 minute bristles (similar to pattern in female); 2 setal bristles on posterior infold dorsal to caudal process; posterior edge of caudal process with 4 minute bristles (Figure 75a).
Carapace Size (length (including caudal process), height in mm): USNM 193947,1.44,1.01.
First Antenna (Figure 75b,c): 1 st joint bare. 2nd joint with dorsal bristle with long stout proximal and short slender distal spines. 3rd and 4th joints fused; 3rd joint with 2 bristles (1 short ventral, 1 longer dorsal); 4th joint with 3 bristles (2 long slender ventral, 1 shorter, stouter, dorsal). 5th joint wedged ventrally between 4th and 6th joints; sensory bristle long with 4 short distal filaments, bifurcate tip, and proximal cup with abundant thin filaments (filaments not shown). Medial bristle of 6th joint short with few widely spaced spines. 7th joint: a-bristle about twice length of bristle of 6th joint, with short spines; b-bristle long, with small distal filament and terminal spine; c-bristle reaching slightly past sensory bristle of 5th joint, with 1 small proximal filament, 4 small distal filaments, and bifurcate tip.
8th joint: d- and e-bristles longer than b-bristle, bare with blunt tips; f-bristle about same length as e-bristle, with 1 small proximal filament, 3 small distal filaments, and bifurcate tip;
134
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGYFIGURE IS.—Eusarsiella bex, new species, adult male, nontype, USNM 193947: a, complete specimen from right side, length including caudal process 1.44 mm; b, part of left 1st antenna, lv (not all bristles shown); c, tip of right 1 st antenna, mv; d, endopodite and part of protopodite, left 2nd antenna, mv; e, left mandible, mv; / , part of right mandible, lv; g. right 6th limb, lv; h, right 7th limb, lv; i. medial eye and Bellonci organ from right side; j , left lateral eye; k, /, anterior and posterior of body, respectively, from right side, anterior to right; m, left lamella of furca.