282 



WEST COAST SHELLS 



Canyon of the Colorado, oppo- 

 site the Kaibab plateau, at an 

 elevation of 3500 feet. The 

 views. of the shell given in Fig- 

 ure 271 are magnified to twice 

 their real diameter, but they 

 give the form with great detail. 

 The shell is rather fragile, and 

 varies from pale horn-color to 

 white, w^ith a reddish brown 

 band. 



Yjpipliragmo pliora exarata,, 

 Pfr., the Furrowed Snail, is a 

 species which resembles a small 

 specimen of the next species. 

 The shell is yellowish in color, 

 with a narrow band of chest- 

 nut, and the surface is decid- 

 edly plowed up with fine trans- 

 verse furrows. There are seven 

 whorls, ending in a white, 

 slightly refiected lip. This spe- 

 cies is from the coast region of 



California, both north and south of San Francisco. 



Its diameter is about an inch. 

 Epiphragniopliora arrosa^ 



Gld., the Dented vSnail, 



shown in Figure 272, has a 



fine, large, and rather solid 



shell. The seven whorls, 



which are yellowish-brown 



in color, are banded with a Fig, 272 



Fig. 271, XI (*) 



