188 



WEST COAST SHELLS 



The Odostomias have polished, white 

 shells, less slender than those of the last 

 genus. On the columella is a fold like a 

 Fig. 179 tooth, as their name indicates. There are a 

 good man}^ species, most of which are very small. 

 One of the largest shells is rather poorly shown in 

 Figure 179. It is known as Odostomia satura^ Cpr., 

 the Full Odostomia, (0. pupiformis). This shell is 

 beautifully white, not very thick, with deep sutures 



and a microscopic net- 

 work of extremely fine 

 lines. It is about a quar- 

 ter of an inch in length, 

 and it ranges from Neah 

 Bay to unknown distan- 

 ces. 



Odostomia nuciformis^ 

 Cpr., the Nut-shaped 

 Odostomia, is also a 

 northern species, though 

 it sometimes grows a lit- 

 tle larger than the shell 

 last mentioned. It is 

 rather stout and inflated 

 and has a large body- 

 whorl. The shell is white 

 and solid, and the colu- 

 mella has a strong fold. 



Other species will be 



mentioned in the list, but 



it is hoped that these few 



^ig. 180 samples will be enough 



