CRAS8ATKLLITES. 12<) 



Init is iiKiiv iii(M|iiilat('i-iil, the ventral margin is nearly straight, llie posterior 

 mai'giii is more obliqne, and the posterior area is relatively smaller. It is much 

 more inequilateral than ('. regularis, d'0rbign3^^ C. divifiiensi.s also resembles 

 some of the varieties of C. macrodonta (Sowerby)- from Gosaii. 



Distribution. — Upper Greensand (zone of Sclilmnhacliia roxtrata) of Devizes. 

 An imperfect specimen from Warminster (zone of Pecten asjier) probably belongs 

 to this species. 



Ci!AssATi:rj,iTE8 viXDiNNENSis {d' Orhif/mj), 1844. Plate XIX, figs. 2, o. 



1844. Crassatella vindinnensis, A. d'Oihiijuy. Pal. Fran^. Terr. Cri't., vol. iii, 



ji. 79, pi. cclxvi, figs. 1 — 3. 

 1850. — vENDiNNENSis, d'Orbigtiij. Prodr. tie Pal., vol. ii, p. 160. 



1867. — VINDINNENSIS, E. Gurnviger. Album Pali'ont. de la Saribc, 



p. 13, pi. \vi, figs. 9, 10. 

 ? 1868. — — C. W. Giimbel. Geo<^u. Beschreib. Ki'migreicbs 



Bajern, vol. ii, p. 766. 

 1871. — — F. Sloliczka. PalBeont. Iiidica, Cret. Fauna S. 



India, vol. iii, p. 294. 



Deserijitiun. — Sliell sulKpiadrate, bnt trigonal without the posterior area, very 

 inequilateral, convex, with rounded carina. Anterior margin rounded, passing 

 gradually into the slightly curved ventral margin ; posterior margin oblique, some- 

 what sinuous ; postero-dorsal margin nearly straight, forming an obtuse angle with 

 the posterior margin. Lunule elongate, deep. Uml)ones prominent, incurved. 

 Posterior area of moderate size, divided by a median rib into two parts, of which 

 the anterior is concave. 



Ornamentation consists of strong, regular, concentric ribs, separated l^y narrow 

 fnrrows. On the posterior area the ribs become very narrow and more or less 

 lamellar, and the interspaces are broad and flat. 



Measurements : 



(1) (2) 



Length ... 31 .. 30 mm. 



Height . . . 26 . . 20 „ 



(1, 2) Duuscombe. 

 Ajfiiiitirs. — This s]iccie.s is related to ('. Iltirrifiisis, d'Oi-i)igny,-' and ('. (luvraii- 



' Op. cit., p. 80, pi. cclxvi, figs. 4 — 7. 



2 Zittd, "Bivalv. d. Gosaugeb." (' Denkschr. d. k. .Akad. Wien, Matli.-Nat. CI.,' vol. xxv, pt. 2, 

 1866), p. 150, pi. viii, figs. 2, 3. 



^ ' Pal. Fi-an9. Terr. Crct.,' vol. iii (1844), p. 77. pi. cclxv, figs. 3—5 ; Guurauger, ' Album Pali'out. 

 de la Sarthe' (1867). \k 13, ].l. xvi, fig. 12. 



17 



