118 CRETACEOUS LAMELLIBRANCHIA. 



outline, and apparently also fewer ril)s. Two imperfect specimens from the 

 Cenomanian (Bed 11) of Dunscombe were referred to A. Komnchi hy tlie late 

 C. J. A. Meyer, but tliey are less convex than that species aiid seem to agree 

 more nearly with A. xtriafa. 



Astarte concinna, Sowerby, was regarded by Stoliczka as probal)ly identical with 

 A. striata. It is known by the type specimen only, and agrees with A. striata, 

 except that it is rather higher and more inequilateral. I believe that it is merely 

 an individual variation of A. striata. 



Types. — From Blackdown, in the British Museum. The type of A. concivna is 

 from Blackdown and is now in the Bristol Museum. 



Distrihutioii. — Upper Greensand (zone of Sclihrnliacliin msfrata) of Blackdown. 



Genus— Oris, M. J. L. Defrance, 182-5. 

 (' Diet. Sci. nat.' vol. xxxvi, p. 219.) 



Oi'is NEOCOMiENSis, d'Orhigny, 1844. Plate XVII, figs. 8-12. 



1842. Opis a. Leymerie. Mem. Soc. geol. dp France, ser. 2, vol. v, 



p. 25, pi. vii, fig. 4. 

 1844. — NEOCOMIENSIS, A. cVOrlngny. Pal. Fran9. Terr. Crct., vol. iii, p. 51, 



pi. ccliii, figs. 1 — 5. 

 1850. — — d'Orbigny. Prodr. de Pal., vol. ii, p. 76. 



1855. — — G. Coitcau. Moll. Foss. de IToune, p. 67. 



1857. — — F.J. Pictet and E. Renevicr. Foss. Terr. Aiptien{Mat6r. 



Pal. Suisse, ser. 1), p. 

 83, pi. ix, fig. 7. 

 1861. — Desoei, p. (le Lorinl. Anim. Invert. Foss. Mt. Saltve, p. 66, pi. viii, 



figs. 4—7. 

 1866. — NEOCOMIENSIS, F. J. Pictet and G. Campiche. Foss. Terr. Crt't. Ste. 



Croix (Mator. Pal. Suisse, ser. 4), 

 p. 324, pi. cxxv, figs 3, 4. 

 1868. — — P. de Lorinl. Valangien d'Arzier, p. 31. 



9 1871. — — W. A. Ooster. Protozoa Helvet., vol. ii, p. 101, pi. xv, 



fig. 17. 

 1883. — — W. Keeping. Foss. etc., Neoc. Upware and Brickhill, 



p. 121, pi. vi, fig. 8. 

 1900. — — A. Wollemann. Die Eiv. u. Gastrop. d. clcutscli. u. 



liolliind. Neocoms (Ablumdl. d. k. 

 preussisch. geol. Land., N. F., pt. 

 31), p. 102. 



Description. — Shell trigonal or sub-quadrilateral, much higher than long, 

 inequilateral, greatly inflated, but with flattened sides. Anterior margin rounded. 



