ir.S rRETATEOFS LAMELLTBRANCHIA. 



1842. Cakdium oallopeovinciale, P. Maihcron. Catal. Poss. du Depart, des 



Bouclies-du-Rhone, p. 155, 

 pi. xvii, fi<,'.s. 1, 2. 



1844. CoRBis conDiFORMis, A. iVOihiijiiij. Pal. Frau9. Terr. Crut., vol. iii, p. Ill, 



pi. cclxxix. 



1845. — COEEUOATA, E. Forhes. Quart. Journ. Geol. Soc, vol. i, p. 239. 

 1850. — — cVOrhifjny. Prodr. de Pal., vol. ii, p. 78. 



1854. Sph^ea — J. Morris. Cat. Brit. Foss., ed. 2, p. 224. 



1865. Cordis — G. CoUeau. Moll. Foss. de I'Yonne, p. 80. 



185G. — —F.J. Pldd nmJ E. Renevicr. Foss. Terr. Aptien (Matrr. 



Pal. Suisse, ser. 1), j). 7(5, pi. viii, 

 fig. 3. 

 1859. — coEDiFOEMis, /. Vilanova-y-Plera. Mem. geog.-agric. de Castellon, 



pi. iii, fig. 13. 

 18G5. — coERUOATA, H. Coqnand. Mou. Aptien de I'Espagne, p. IIG. 

 18CC. FiMBEiA — F. J. Picfet and G. Campiche. Foss. Terr. Crc't. Ste. 



Croix (Mater. Pal. Suisse, 

 ser. 4), p. 279. 

 18G9. Pal^ocoebis coedifoemis, T. A. Conrad. Amer. Jouru. Coucli., vol. v, 



p. 101. 

 1871. SiMLTiRA coREUQATA, F. SloliczJca. Palooout. ludiea, Cret. Fauna S. India, 



vol. iii, pp. 247, 252. 

 V 1877. CoEBis ef, COERUOATA, G. Bolim. Zoitschr. d. deutscli. geol. Gesellsch., vol. 



xxix, p. 240. 

 1897. — coEEtTGATA, 7v. Gerhavdt . Neues Jalirb. fiir Min., etc., Beil.-Bd. xi, 



p. 186. 

 1899. Fimbria — A. WuJlcmann. Zeitschr. der deutscli. geol. Gesellsch., 



vol. li, p. 592. 



Description. — Shell large, stout, inflated, subglobular, slightly inequilateral, 

 height and length nearly equal. Anterior margin rounded, forming an angle with the 

 hinge-margin, and passing gradually into the ventral margin with which it forms 

 a regular curve. The ventral margin curves rapidly towards the posterior margin, 

 Avhich makes an obtuse angle with the hinge-margin. Lunule flattened or depressed, 

 with a swollen lower margin which is separated from the rest of the valve l)y a 

 furrow. Escutcheon triangular, limited by a furrow which passes from the umbo 

 to the posterior margin. Umbones large, ])rominent, ciu'ved anteriorly'. Ornamen- 

 tation consists of broad, strong, unequal, concentric ridges which arc more numerous 

 on the middle than on the anterior and posterior parts of the shell. The concentric 

 ridges are crossed l)y numerous, small, radial ril)s. 



Measurements : 



(1) (2) (3) (4) 



Ecnglh 95 . 84 . 80 . 70 mm. 

 Heiglit 93 . 8:3 . 77 . G8 „ 



(1 — 4) Lower Greeiisninl, Atlierficld. 



