40 CRETACEOUS LAMELLIBRANCHIA. 



3. Tipper Cretaceous Species. 



Barbatia Hugaediana (d'Orbigmj), 1844. 



1844. Akca Hugaediana, A. d'Orbigny. Pal. FraLc. Terr. Cret., vol. iii, p. 216, 



pi. cccxiii, figs. 4 — 6. 

 1850. — — Prodr. de Pal., vol. ii, p. 138. 



1852. — F. J. Pictet and W. Boux. Moll. Foss. Gres verts de 



Geneve, p. 457, pi. xxxvi, fig. 1. 

 1866. — F. J. Pictet and G. Campiche. Foss. du Cret. de Ste. 



Croix (Mater. Pal. Suisse, ser. 4), pt. 3, p. 460. 

 1871. — — F. Stoliczka. Palseont. Indica, Cret. Fauna S. India, 



vol. iii, p. 343 (Barbatia). 

 1875. — — A. J. JuJces-Broivne. 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 (Soicerby), 1836. Plate VII, figs. 8 a — c. 



183G. Abca eotusdata, J. de C. Soicerby. Trans. Geol. Soc, ser. 2, vol. iv, 



p. 342, pi. xvii, fig. 8.. 



1848. — eotundita, H. P. Nyst. Tableau des Especes vivant et foss. des 



Arcacees (Mem. Acad. Eoy. Belgique, 

 vol. xxii), p. 64. 



1854. — eotundata, J. Morris. Cat. Brit. Foss., ed. 2, p. 185. 



1866. — F. J. Pictet and G. Campiche. Foss. du Terr. Cret. de 



Ste. Croix (Mater. Pal. Suisse, ser. 4), pt. iii, p. 473. 



187 1. — — F. Stoliczka. Palseont. Indica, Cret. Fauna S. India, 



vol. iii, p. 343 (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 ......... 26 mm. 



Height (approximate) . . . . . 15 ,, 



