Eocene (lowest), 200 m S of 1026 (which is just S of the Riverside Club), on the W side of the Almendares River in Reparto Kohly, Habana Province. It can be expected in any Tertiary sediments of Cuba and elsewhere in the Caribbean. Unfortunately, most of the specimens in Palmer's collection are too poor to be useful.
Dorsal valve rather even and moderately convex in lateral profile; anterior profile moderately convex, about as convex as the opposite flap. Dorsal valve interior with loop occupying slightly more than one third of valve length. COMPARISON AND DISCUSSION.-This species is not characteristic of the genus to which it is referred.
The characteristic external features of Tichosina appear in the strongly labiate permosothyridid foramen and the single folding of the anterior commissure. The broad fold produces a correspondingly broad and conspicuous flattening of the anterior half of the ventral valve. Ventral valve slightly convex in lateral profile, m a x i m u m convexity in a midvalve b o u t ; front profile strongly domed, t h e t o p dome flat-.
The cardinalia of this family suggest that of Terebratalia in the confirmation of the crucial bases.
PLATES
FIGURES 2-5. Lacazella caribbeanensis Cooper: 2-4, ventral, lateral and dorsal views, X8, of a hypotype, USNM 549402a, showing the broad attachment scar; 5, inside of the dorsal valve. 11-14, ventral, lateral, anterior and dorsal views of the holotype x 2 with narrow, deep ventral sulcus and serrated dorsal valve. 35, 36, Partial lateral and ventral views, x 2, of the posterior part of the dorsal valve of an anodier specimen, showing the narrow, massive, descending branch of the loop, the broad transverse ribbon, and the flattened outer hinge plates, hypotype, USNM- 109734a.
FIGURES 6-10.—Stenosarina cuneata, new species: Posterior, anterior, lateral, ventral, and dorsal views of the holotype, X l , USNM 549436a. FIGURES 11-16.—Tichosina guppyi, new species: 11-15, posterior, anterior, lateral, dorsal, and ventral views of holotype, Xl, USNM posterior of holotype, excavated to show matrix descending branches of matrix loop, x 2, as the transverse band is broken away. FIGURES 31-35.—Tichosina} trinitatensis (Guppy): Dorsal, anterior, lateral, posterior, and ventral views, x l , of the holotype, USNM 115647, showing broad, uniform anterior commissure.
FIGURES 1-5.—Tichosina} insolita, new species: ventral, posterior, lateral, anterior, and dorsal views of holotype, x l, USNM 550334, showing uniplicate anterior commissure. FIGURES 30-32.—Gryphus vaughani (Cooke): Dorsal, lateral, and anterior views of lectotype, X l, USNM 167202a, showing uniplicate anterior commissure. FIGURES 1-5.—Argyrotheca cyrtiniformis, new species: 1-3, posterior, dorsal, and lateral views of entire specimen, x 4, holotype, USNM 550336a; 4, interior of brachial valve of holotype, x 4; 5, interior of pedicle valve of holotype, x 4.
FIGURES 16-20.—Argyrotheca sublamellosa, new species: Posterior, ventral, lateral, dorsal, and anterior views of the holotype, x 4, USNM 550453. FIGURES 21-25.—Argyrotheca intercalata, new species: Dorsal, posterior, side , anterior and ventral views of the holotype, x 4, showing the distal, interposed costae, USNM 550448. FIGURES 26-30.—Argyrotheca magnicostata, new species: Ventral, posterior, lateral, anterior, and dorsal views of the holotype, x 4 , showing the thick, anteriorly divided costae, USNM 550451.
FIGURES 31-35.—Argyrotheca serrata, new species: Anterior, dorsal, lateral, ventral, and posterior views of the holotype, x 4, showing the crowded costae and closely notched margins, USNM 550456. FIGURES 36-40.—Argyrotheaca , new species: Dorsal, anterior, lateral, posterior, and ventral views of the holotype, x 4 , showing costae of nearly equal size at the margins, USNM 550452. FIGURES 1, 2.—Gryphus vaughani (Cooke): 1, Interior of a silicified pedicle flap showing thickened posterior region and tiny foramen, x l, hypotype USNM interior of dorsal flap belonging to the preceding, x l, showing cardinal process and thickened outer hinge plates.
FIGURES 26-30.—Argyrotheca peculiaris, new species: Dorsal, anterior, lateral, posterior, and ventral views of this aberrant species, x 4 holotype USNM 550449. FIGURES 31-36.—Argyrotheca anomala, new species: 31 , 32, Interior and exterior of ventral valve, XlO, showing holes in anterior extension of median septum and nearly smooth exterior, paratype USNM 550454a; 33, 34, exterior and interior, xlO, of a dorsal valve showing median thickening, paratype USNM 550454b; 35, 36, interior and exterior of a dorsal valve, XlO, showing nearly smooth exterior and interior sections, holotype USNM 550454c.
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