40 CRETACEOUS LAMELLIBRANCHIA. 
3. Upper Cretaceous Species. 
Barsatia Hucarpiana (d’Orbigny), 1844. 
1844. Anca Huaarpiana, A. d’Orligny. Pal. Frarg. Terr. Crét., vol. iii, p. 216, 
pl. ceexii, figs. 4—6. 
1850. — — — Prodr. de Pal., vol. ii, p. 188. 
1852, — —— F. J. Pictet and W. Roux. Moll. Foss. Grés verts de 
Geneve, p. 457, pl. xxxvi, fig. 1. 
1866. — _ F. J. Pictet and G. Campiche. Yoss. du Crét. de Ste. 
Croix (Matér, Pal. Suisse, ser. 4), pt. 3, p. 460. 
1s7l.  — _ F. Stoliczka. Paleont. Indica, Cret. Fauna 8. India, 
vol. 1, p. 843 (Barbatia). 
1875. — -- A. J. Jukes-Browne. Quart. Journ. Geol. Soc., vol. 
xxxi, p. 299 (? partim). 
Some internal casts from the Cambridge Greensand (derived) may perhaps 
belong to this species. 
BarBaTiA RoTUNDATA (Sowerby), 1836. Plate VII, figs. 8 a—e. 
18386. Arca rotunpata, J. de C. Sowerby. Trans. Geol. Soc., ser. 2, vol. iv, 
p- 342, pl. xvii, fig. 8. 
1848.  — rorunpira, H. P. Nyst. Tableau des Espéces vivant et foss. des 
Arcacées (Mém. Acad. Roy. Belgique, 
vol. xxii), p. 64. 
1854. — rotunpata, J. Morris. Cat. Brit. Foss., ed. 2, p. 185. 
1866. — i F. J. Pictet and G. Campiche. Foss. du Terr. Crét. de 
Ste. Croix (Matér. Pal. Suisse, ser. 4), pt. 1, p. 473. 
1871. — — F. Stoliczka, Paleont. Indica, Cret. Fauna S. India, 
vol. iil, p. 843 (Barbatia). 
Description. —Shell moderately convex, oblong, inequilateral, highest pos- 
teriorly. Anterior and posterior margins rounded; ventral oblique to the hinge- 
line, sinuous at the middle. Umbones close together, with an ill-defined posterior 
carina. Shell much compressed postero-dorsally; also slightly compressed 
ventral to the umbones. Ornamentation consists of numerous fine radial ribs 
separated by narrow grooves, and crossed by a few distant concentric growth- 
lines. Interior not seen. 
Measurements : 
Length . ; : : : : : 5 . 26mm. 
Height (approximate) . : : 2 ; 5 1S) 
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