\ 



# 



PLATE 40 A. 



Fig. 1. 245. 6. BucANiA pttnctifeons. (Pag. 187.) 



1 a. Donal view of a small specimen. 1 b. Lateral view, showing the umbilicus. 



I e. Dorsal view of a larger specimen, showing the elevated carinal band, which does not rise above the sur- 

 face on the lower part of the shell. 



1 d. Lateral view of another specimen, showing the side of the shell, which is obtusely angular, with obscure 

 longitudinal ridges. 



1 e. A portion of the surface enlarged. 



Fig. 2. 246. 1. Cyktolites compressus. (Pag- 188.) 



2 a. Lateral view of a specimen, having the sinuous lamells at the ordinary distance asunder. 

 2 b. Dorsal view of the same. 



2 e. Lateral view of a specimen, where the elevated lamellae are more distant. 

 2 d. Lateral view of another, showing the lamellae closely arranged. 



2 e. A cast, which is smooth, with the exception of the elevated carina. 



'if. A portion of the surface enlarged, showing the finer transverse and longitudinal strie, and the subnodu- 

 lose appearance of the surface. 



Fig. 3. 247. 2. Cyrtolites trentonensis. (Pag. 189.) 



3 a, b. View of the upper surface of two individuals. 3 e. Lower surface of the same. 3 d. Dorsal view. 



Fig. 4. 249. 1. Trocholites ammonius. (Pag- 192.) 



4 a. A small perfect specimen, showing the lamellose strie in great perfection. 

 4 6. A large specimen, preserving the lamellose surface. 



4 e. Dorsal view, showing the archings of the stris upon the back. 



4 d. A specimen denuded uf the shell, showing the septa and deep outer chamber. 



4 e. Section, showing the position of the siphuncle. 



4/, g. Lateral and dorsal view of a fiagment of an inner volution, showing a slight undulation of the septa 



on the back. 

 4 A. Lateral view of a fragment partially denuded of the shell, showing only the oblique transverse ridges. 

 4 t. Dorsal view of the same, showing the arching of the striie upon the back. 

 4 k. Section of the same, showing the position of the siphuncle. 



