150 



WEST COAST SHELLS 



is dark and mournful. An old name for this shell 

 is Euthria dira. 



Chrysodomus liratus^ Mart., the Ridged Chryso- 

 dome, is a large Alaskan species, having a light 

 brown shell some three inches long, swollen in the 

 middle and pointed at both ends. The chief feature 

 is the set of about ten strong ridges, or carinae, which 

 circle around the shell in a spiral manner, leading 

 back from the outer lip to the very apex. I once 

 obtained a fine specimen of this shell on Wrangel 

 Island. 



Figure 128 gives a good idea 

 of a somewhat similar shell 

 known as Chrysodomus tahula- 

 tus, Baird, the Tabled Chryso- 

 dome. It lives along the coast 

 of Vancouver Island south- 

 ward, inhabiting deeper and 

 deeper water on the way. A 

 beautiful specimen was re- 

 cently dredged in Monterey 

 Bay. The shell is usually of 

 a yellowish white color, though 

 sometimes darker, and it can 

 be readily identified by the 

 tabulated whorls, with their 

 fiat tops. It is also found as 

 Fig. 128, x^ (*) a fossil. 



Chrysodomus kellettii^ 

 Forbes, Kellett's Chrysodome, is one of the largest of 

 our mollusks. The shell is strong and heavy, and 

 sometimes measures nearly six inches in length. It 



