PLATE XXII. 



, AscocERAs cosTULATUM (page 215). 



Figure 1. View of the ventral side of the only specimen colleoted, shewing most of 

 the deonrrent extremity of the body chamber, and portions of the 



EURYSTOMITES PLICATUS (page 225). 



Figure 2. Side view of an imperfect specimen of this species from Little Black Island, 

 shewing the surface ornamentation of part of the outer volution. 



DiscocEBAS Canadense (page 227). 



Figure 3. Side view of the most perfect specimen collected. 



M 3a. Outline of transverse section of the same, shewing the position of the 

 siphunole. 



Aparchites parvulus (page 230). 



Figure 4a. Side view of right valve, in outline, and magnified five diameters. 

 II 46. Ventral outline of the same, 

 ir 4o. Edge outline of the same. 



