None of the species found in the above deposits were found in the material examined for my report. It resembles pseudohaitensis Maury from the Cercado formation.. M. icilcoxii Dall from the ChiiX)la marl member of the Alum Bluff formation.
ART. 22 MIOCENE GASTROPODS AND SCAPHOPODS MANSFIELD 11
Suture of early whorls shallowly channeled and somewhat depressed, in later whorls less depressed and more deeply channelled. The most prominent character of the new species is the strong spiral band before the spiral suture.
AKT. 22 MIOCENE GASTROPODS AND SCAPHOPODS MANSFIELD 13
Axial sculpture consists of seven strong, somewhat nodular ribs in front of analfasciole; the ribs are more prominent on the earlier vertebrae and at the bottom of the body vertebrae - barely extending. Whorls strongly constricted at the suture Avith the prominent periphery in front of the anal fasciole.
ART. 22 MIOCENE GASTROPODS AND SCAPHOPODS MANSFIELD 15 suture to suture, and much jfiner spirals overrunning the axials anrl
Axial sculpture (20 on the penultimate whorl) on the spire whorls consists of slightly projecting, knobbly ribs at the intersections of the spirals, separated by gaps of half their length. Spiral shaped with a strong keel just in front of the suture and two or three microscopic threads at the lower edge of the suture.
ART. 22 MIOCENE GASTROPODS AND SCAPHOPODS MANSFIELD 17 the latter is more open and possesses nodules at the intersection of the
Postnuclear whorls with strong ribs (13 on the last whorl), nodular on the early whorls and rounded on the later, suppressed within the indistinct anal fasciole and protractively displaced and nodular on the subsutural band. At the base the axials terminate at the posterior part of the canal; the spirals first cross the axials, but later continue only to the end of the channel.
RT. 22 MIOCEXE GASTROPODS AND SCAPHOPODS MANSFIELD 19
On the posterior side of the body whorl, approximately twelve fairly uniform spirals extend from the anal fasciole across the canal. At the back of the body whorl, 14 spirals extend from the anal fasciole across the canal.
ART. 22 MIOCENE GASTROPODS AND SCAPHOPODS MANSFIELD 29
30 PROCEDURE OF THE NATIONAL MUSEUM yoL.06 lip broken off; pillar with two oblique, rounded wires; anterior canal short, partially broken away. Medium sized shell, biconical. massive, elaborately sculpted, seven and a half whorls, including one and a half nuclear whorls. Sculpture consists of three primary ones. spiral bands, finely tubular on the earlier whorls, coarsely elongated tubular on the later whorls; the posterior band is widest and almost adjacent to the suture, except for two spiral threads just anterior to the suture, and separated anteriorly by a fairly broad chamael with irregular axial streamlines; the two anterior bands are narrow, close together, axially crossed and connected by elongated tubercles or short ribs and cover the lower periphery of the whorl; One or two granulose coils are located between the peripheral bands and the anterior suture.
The body whorl sculpture, below the circumferential bands and extending to the end of the canal, consists of about thirteen narrow, semi-cuboid, widely spaced spiral bands, interrupted by a varying number of fine spiral threads. Urate inside; columella with three uses: the pos-. the front is strong, the front is weak. end of channel slightly broken); largest diameter 6.5 mm.
ART. 22 MIOCENE GASTROPODS AND SCAPHOPODS MANSFIELD .31
Spiral sculpture (two on the first whorl and three on the second whorl) of widely spaced cords, equally strongly overlapping the axes and occupying the periphery of the whorl: there are 11 of these large spirals on the base and channel; except for these larger ones. Aperture about half the length of the shell, oval in outline; its anterior extremity forms a broad, short, rounded, reflexed canal that borders the anterior extremity. The whole shell was covered Avith a thin callus, except a narrow region which encircled the lower half of the whorl of the body, and began opposite the column, and extended to the margin of the outer lip ; a heavier callus on the body whorl borders the non-calloused area and extends parallel to the axis of the whorl from the suture to the upper margin of the opening.
Shell surface with a thin wash of callus, except for a striated area surrounding the lower half of the body whorl, beginning opposite the spine and extending to the edge of the outer lip; a heavier longitudinal callus on the body whorl marginalizes the uncalcified area and joins the posterior edge of the columnar plate just below the posterior commissure of the aperture. ART.22 MANSFIELD MIOCENE GASTBOPODI AND SCAPHOPODI 35 margination; upper limit of backslope marks.
ART. 22 MIOCENE GASTBOPODS AND SCAPHOPODS MANSFIELD 35 emargination ; the upper margin of the posterior plication marks
Axial sculpture of about twelve strong, rather sharp, triangular ribs, extending from the base of the shoulder posteriorly to the suture on the parietal crest and forward on the body crest almost to the anterior limb. Body whorl surface slightly depressed behind the rounded shoulder and marked by broad, axial ridges extending from the spiral stria forward to the circumference of the whorl. The back of the outer lip is a little higher than the tip and its margin is anchored to the tip by a wash of callus; margin arcuate and bordered by a strong lip varix.
Outer lip with a strong Avell-defined varicose vein, ornamented within but not beyond the varicose vein or over the posterior one-fifth of the margin, Avith serrations; pillar concave and provided with four grooved plates - the. Columella with four equally spaced, externally papillary plications: the anterior two are stronger and more oblique, one end is sharp and adjacent to the inner wall of the canal.
ART. 22 MIOCENE GASTROPODS AND SCAPHOPODS MANSFIELD 41 MARGIN ELLA (GIBBERULA) TRTNITATENSIS, new species
In looking ovei^ the Guppy. collection, now in the National Museum, I find a species from Cumana, labeled M. coniformis^ but which cannot be distinguished from M. The new species described here is very closely related to M. The nearest recent ally, M. obesa Eedfield, has a more sloping posterior shoulder than the new species. Sculpture on the spire whorls of three to four, sharp, narrow, well-separated raised, primary spiral lines, interspersed with three to four secondary spirals, which are crossed axially by growth lines of about equal strength, giving the area a canceled appearance.
ART. 22 MIOCENE GASTROPODS AND SCAPHOPODS MANSFIELD 43 posterior one strongest and the following ones gradually diminish-
Axial sculpture of postnuclear whorls of (seven on penultimate and eight on last whorl) strong, rounded ribs extending anteriorly on last whorl to siphon canal. Spiral sculpture of (7 on the penultimate whorl and 17 on the last whorl and canal) broadly rounded prominent lines beginning above at the shoulder and continuing on the last whorl of equal strength above the axials. and descend to the carina of the siphonal fasciole. Axial sculpture of about twelve strong, rounded ribs extending from suture to suture on the spire and to the siphonal fasciole on the body whorl.
The new species differs from Maury's species, Alectrioncercadensis^. in smaller numbers and stronger spirals on the whorl of the body. ARTICLE 22 MIOCENE SNAILS AND SCHAPHONOPODAS MANSFIELD 47 weak axes and on the following whorls (fifteen to seventeen.
ART. 22 MIOCENE GASTROPODS AND SCAPHOPODS MANSFIELD 47 of faint axials and on the following whorls of (fifteen to seventeen
Its closest ally among the Dominican fauna is Strornbina fseudohaitensis Maury, Cercado Formation, but this species is larger, has stronger radials on the spire, and has a weak spiral spine directly below the suture. The varices are very strong on the three anterior vertebrae, displaced to the left at the suture and overlapping the preceding vertebra, terminating at the base of the intervarical tube and lying between the varix and the rib. The intervarical ribs extend on the spire vertebrae from the shoulder to the succeeding suture and on the last vertebra to the base.
Anterior canal curved to the right and on the left side strengthened by three anterior-converging varices. This species resembles Typhis gabhi Brown and Pilsbry from the Gatun Formation, Panama, but this species has wrinkled and depressed sculpture marks on the last whorl not seen on the new one.
AET. 22 MIOCENE GASTROPODS AND SCAPHOPODS MANSFIELD 49
Plug does not extend far above the edge of the bowl; mucro small, located on the edge on the convex side. On the later whorls the three primary spirals continue, with the lower two becoming more prominent and the presutural being a little stronger and forming the outline of the whorl. Another beaded spiral lies near the upper base of the trailing edge, weak in the early whorls, but gradually increasing in strength as the whorl ascends.
The species resembles Tui^Htella chiqyolana Dall, from the Chipola Marl Member of the Alum Bluff Formation, Florida. Spiral sculpture on the early whorls of two low, weakly knobby cords bordering the upper and lower shoulders of the whorl and separated by a shallow, broadly rounded concayity.
ABT. 22 MIOCENE GASTEOPODS AND SCAPHOPODS MANSFIELD 55 anterior member is always stronger and originates first while the
ABT.22 MIOCENE GASTEOPODS AND SCAPHOPODS MANSFIELD 55the anterior joint is always stronger and originates first, while it is. The earliest whorls on the specimens discussed are slightly convex at the equator and gradually slope towards the superior and inferior sutures. As you climb the spire, the whorls gradually flatten and rise slightly from the top of the whorl to the base. it is very likely that the earliest whorls are medially carinate.
On the earlier whorls these whorls are very close, separated by spiral striations, but on the later whorls these intervals widen. The base of the whorl is similarly sculptured, except for a narrow, circular excavated furrow that is located slightly below the angled shoulder.
AST. 22 MIOCENE GASTROPODS AND SCAPHOPODS MANSFIELD 59 CALUOSTOMA RHOMBOTUM, new species
Shell small, solid, sub-hemispherical, three and a half whorls, and consisting largely of the last whorl; vertebrae inflated; suture distinct, but shallowly depressed on spire whorls, and close-fitting. Sculpture on last whorl of closely spaced, microscopic spiral striations less distinct on base. Shell fragile, subdiscoidal, spire nearly flat, about four whorls, one-third of last whorl broken off; body spiral with two widely separated spiral carini, the upper one high and thin, and situated near the center of the whorl forming the periphery, the lower one.
One of these occupies the center part of the wreath; on the next wreath one occupies the middle part of the wreath; a new spiral begins on the next whorl. All specimens received with the type from Pointe-a-Pierre, the type locality, have this feature present and is one of the outstanding features of the species.
EXPLANATION OF PLATES
There are numerous fragments of the genus Dentalium from. station 8302, one mile south of Brass, which may represent one or two new species. The interaxial appears early on the shell among the six primaries; other interactions soon arrive, rounding out the surface in the rising.
ART. 22 MIOCENE GASTEOPODS AND SCAPHOPODS MANSFIELD 65 Plate 7
S. NATIONAL MUSEUM
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