PLATE V. 



Trtblidium Oanadbnse (page 31). 



Figure 1. Cast of the interior, as seen from above. 

 " la. Lateral view of the same specimen. 



ScENELLA CONICA (page 32). 



Figure 2. Summit view of a cast. 

 " 2a. Side view of the same. 



BucANiA STiGMOSA, (?) Hall, (page 34). 



Figure 3. Side view of a cast. 

 " 3a. Another view of the same, to show the shape of the aperture and 

 periphery. The periphery, however, is usually subcarinated, 

 and the aperture more expanded, as shown on plate 8, fig. 4. 



BcoTJLiOMPHALUs ciRCiNATUS (page 35). 



Figure 4. Upper side of a cast of the interior, from Durham. The two 

 grooves represented in this figure are too strongly defined, 

 and they are entirely obsolete on the anterior half of the 

 specimen. 



" 4a. Upper side of another cast, to show the septate character of the 

 commencement of the volution. 



" 46. Fragment with the test preserved, to show the surface ornamen- 

 tation. 



" 4c. This was intended for an outline of a transverse section of the 

 shell, near the mouth, but it is entirely incorrect. The true 

 shape of a transverse section of the anterior end of the 

 volution is given on plate 8, fig. 5. 



Trochoceras Desplainensb, McChesney, (page 36). 



Figure 5. Drawing from gutta-percha impression of a natural mould col- 

 lected atHespeler. 



