PLATE 40 A. 



Fig. 1. 245. 5. BucANiA punctifeons. (Pag- 187.) 



1 a. Dovsal view of a small specimen. 1 6. Lateral view, showing the umbilicus. 



1 c. Dovsal 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. Cyrtolites compressus. (Pag. 188.) 



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

 2 6. Dorsal view of the same. 



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

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

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



2/. A portion of the surface enlarged, showing the finer transverse and limgitiidinal stria?, and the subnndu- 

 lose appearance of the surface. 



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



^ a, h. View of the upper surface of two individuals. 3 c. 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 striae in great perfection. 



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



4 c. Dorsal view, showing the archings of the stride upon the back. 



4 d. A specimen denuded of 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, sfiowing 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 i. Dorsal view of the same, showing the arching of the stri« upon the back. 

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



