294 



CRETACEOUS LAMELLIBRANCHIA. 



Description. — Shell equivalve, ver}' inequilateral, slightly or moderately convex, 

 becoming ver\- convex in old specimens, in which the later part of the shell grows 

 either perpendicularly to or at an obtuse angle Avith the earlier part ; posterior 



'^^-^. 



Fio. 51. — Inoceramus haltints, Biiliiii St'iioiiian, Worbarrow Bay, Dorset. British Museum, Nu. L:;2177. 

 J'lint cast. Ri"-lit valve ami anterior view. Natural size. 



Fia. 52. — Inoceramus lalticus, Bulim. Anterior view of specimen shown in Fi<^. 53. x J. 



and postero-dorsiil pai'ts compressed; length greater than height, the difference 

 increasing with age. Anterior and ventral margins rounded ; posterior margin 

 forming an obtiise angle wath the hinge. Hinge-line long. Umbones rather 

 small, nearly terminal. 



