PLATE 65. 



Fig. 1. 661. 5, CoNULARIA NIAGARENSIS. ( Pag. 294.) 



1 a. A fragment of a small specimen preserving the shell in great perfection. 



1 b. An enlargement of this surface, showing the character of the strise and intermediate spaces. 



1 c. An impression of the exterior of a similar specimen, where the depressions between the striae are 



distinct, and show the longitudinal stripe, with the narrow punctured depressions between. 

 1 d. An enlargement of the same. 

 1 e. The interior of the shell of a large specimen, showing the characters of the preceding, but proportionally 



stronger. 

 1 /. An enlargement of the same. 



1 g. A cast of the interior, from near the base of the shell. 

 1 g t- An enlargement of the surface of 1 g. 



1 h. The interior of a shell, showing only transverse ridges, except at intervals where broken. 



Fig. 2. 662. 6. Conulakia longa. ( Pag. 295.) 



2 «. A part of a large individual, showing one obtuse angle, with the strong channel, and a part of each of 



the adjoining sides. 

 2 6. A portion of the same enlarged. 

 2 c, d. A fragment of another individual, and an enlargement showing the character of the mould. 



Fig. 3. 660. 37. Orthoceras undulatum. ( Pag. 293.) 



A fragment of this species from near the aperture. 



Fig. 4. 658. 35. Orthoceras cancellatum. ( Pag. 292.) 



4 a, b. An impression of the exterior of this species, in iron pyrites, in which the sharp strise are well pre- 

 served. 



