248 WEST COAST SHELLS 



shell. And lirst we w\\\ consider Fiincturella major ^ 

 Dcill, the Greater Puncturella, shown in Figure 246. 

 It is not a common shell, but it shows the features 

 of the genus in a hne manner. Its color is white, its 

 internal margin is crenulated, and the posterior slope 

 is slightly arched. This fine large shell was dredged 

 in Bering Sea. 



Puncturella galeatea^ Gould, the Helmet Punctur- 

 ella, is an inhabitant of Puget Sound and the ad- 

 jacent waters. It is much smaller than the last 

 species, having a shell that is conical and elevated, 

 being about as high as it is broad. The lissure at the 

 summit is narrow, and internally there is a little pit 

 on each side of the hole-channel. Its color is gray- 

 ish white, and its length is ten millimeters. 



Puncturella cuculata^ Gld., the Cap Puncturella, 

 is found in Puget Sound and also at Monterey. Pre- 

 sumably it exists at various locations between these 

 two extremes. The shell is oval, obliquely conical, 

 ribbed, the wedge-shaped puncture opening towards 

 the shorter side. The color of the shell is white, 

 though the outside is liable to be somewhat dingy. 

 My specimen from Monterey measures about an inch 

 in length and half an inch in height. 



Puncturella cooperi^ Cpr., Cooper's Puncturella, 

 resembles P. galatea^ but the internal plate is solid 

 and plane. The shell is small, being about nine 

 millimeters in length. It has been found at Cata- 

 lina Island. 



Subeniarginula yatesU^ Dall, the Monterey 

 Trough-shell, is an extremeh^ rare shell, two views 

 pt which are shown in Figure 247. A tew speci- 



