PLATE VIII. 



PAGE. 



Tbemanotus Ai.PHicus 145 



Fjg. 1. Lateral view of the specimen described. Tlie projectione on the mariL^in indicate the posi- 

 tion of the dorsal perforations. 



Pleurotomaria occidens 142 



Pig. 2. Lateral view of a specimen, showing the aperture and the form of the volutions. 



Strapakollus Niagarensis 144 



Fig. 3, View of the top of the internal cast described, showing the size and general form. 



Trochonema (Pleltrotomaria) pauper 143 



Fig. 4. View of the specimen, as obtained from a gutta-percha cast in the natural mould. 



Tremanotus (Bucania) trigonostoma 146 



Fig. 5. View of the impression of the aperture and filling of the outer volution of the specimen, 

 showing the iorm of the expansion and aectioQ of the body whorl. f 



SUBULITES TEREBRIFORMIS 141 



Fig. 6. View of the apertural side of the specimen described, showing the general form of the shell 

 and apertuie. The specimen is imperfect ai- each extremity, and restored at the lower end 

 in the drawing, as indicated by the line of fracture. 



Cyrtoceras Hertzeri 3 150 



Fig. 7. Lateral view of the fragment of a cast described, showing the curvature of the shell, the 

 form of the septa and outer chambers, as well as the indications of the surlace orna- 

 mentation. 

 8. View of the summit of the outer chamber, showing the form of the aperture. 



Cyrtoceras myrice 149 



Fig. 9. Lateral view of a specimen of the species, showing ihe curvature of the Shell, the constric- 

 tion near the aperture, the surface characters as seen on the cast, and the septa. 



Phragmoceras parvum 151 



Fig. 10. Lateral view of the specimen described. 



Phragmoceras ellipticum 152 



Fig. 11. View of the side of the outer chamber, showing the curvature of the septum, and the size 

 and position of the siphuucle. 



