PLATE 61. 



Fig. 1. 653. 1. GoMPHocERAS? (Pag. 290.) 



1 a. A young individual much compressed, in the shale. 



1 6. A larger Individual from the limestone. 



Fig. 2. 654. S. Cyrtoceras? cancellatum. ( Pag. 290.) 



2 a. A fragment in shale, which is entirely compressed. The shell is retained on the laiger part of the sur- 



face, and, where exfoliated, the surface is marked by longitudinal stride. 

 2 6. A fragment of a similarly marked specimen from limestone. 

 2 c. Section of the same, showing tlic dorsal position of the siphuncle. 



Fig. 3. 655. 32. Orthoceras ^ {Species U7idciertnined). (Pag. 291.) 



Fig. 4. 656. 33. Orthoceras imbricatum? (Pag. 291.) 



4 a, b, c. Fragments of small individuals of this species. 



