PLATE 63. 



Fig. 1, 4. 658. 35. Orthoceras cancellatum. ( Pag= 292.) 



1. A part of a large individual, where the surface markings are scarcely preserved. 



4 a. A small fragment, having the characters of the surface preserved in a tolerable degree of perfection. 



4 6. A portion of the same enlarged. 



Fig. 2, 3. 657. 34. Orthoceras virgattim? (Pag. 291.) 



2 a. A fragment where the longitudinal ridges are equal and closely arranged. 



2 6. A fragment enlarged. 



3. A fragment where the longitudinal ridges attenuate in size. 



Fig. 5. 659. 36. Orthoceras ? (Pag. 292.) 



