PLATE VIII. 



PAGE. 



Tremaxotus Alpheus 145 



Fig. 1. Lateral view of the specimen described. The projections on the margin indicate the posi- 

 tion of the dorsal perforations. 



PLECROTOM.VRI.i OCCIDENS 142 



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



StRAP.\EOLLUS NlAGARENSrS 144 



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



TrOCHONEMA (PlEUROTOMARIa) PAUPER 143 



Fig. 4. View of the s])ecimen, as obtained from a gutta-percha cast in the natural mould. 



Tremaxotus (Bucania) trigonostoma 146 



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

 .showing the form of the expan.sion and section of the bodj' whorl. 



Subulites terebriformis 141 



Fig. 6. View of the apei't iiral side of the specimen described, showing the general form of the shell 

 and aperture. The specimen is imperfect at each extremity, and restored at the lower end 

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



Cyrtocera.s Hertzeri ■ 150 



Fig. 1. 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 surface 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 the 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. 



Phr.agmocera,s ellipticuji 152 



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

 and position of the siphuncle. 



