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 b. A portion of the same enlarged. 
Fig. 2, 3. 657. 34. Orthoceras virgatum? (Pag. 291.) 
2 a. A fragment where the longitudinal ridges are equal and closely arranged. 
2 b. A fragment enlarged. 
3. A fragment where the longitudinal ridges attenuate in size. 
Fig. 5. 
659. 36. Orthoceras -? 
(Pag. 292.) 
