204 



WEST COAST SHELLS 



ridges. Its color varies from white to black, but it 

 is usually of a yellowish brown. The edge of the 

 outer lip is always sharp and thin. I gathered a 

 bottle ot fine specimens at Old Kasaan, that strange 

 old Indian village in Alaska. This species, which is 

 also known as L. sitcliana^ Phil., comes down the 

 coast as tar as Puget Sound, and possibly farther. 

 The other two are found all along the coast. 



L'lttorina pulUitd^ Cpr., the Dark Littorine. This 

 little species lives on the Mexican coast, but it has 

 been found as far north as San Pedro. The shell 

 resembles that of L. scutulata^ but it is of a dark, 

 reddish brown color, sometimes checked, and there 

 are numerous very fine spiral lines of sculpture. It 

 was described in 1864. 



Littorina alcutica, Dall, the 

 Aleutian Littorine, Figure 196, 

 is found in the far north, as its 

 name indicates. The broad 

 pillar, or columella, of the shell 

 is white, the aperture is dark, 

 while the outside of the shell is 

 yellowish brown. An enci view 

 is given in Figure 197. The 

 pictures are considerably mag- 

 nified, the real diameter being 

 about twelve millimeters. 



Another shell from the same 

 locality is shown in Figure 

 198. It is named Littorina at- 

 kana, Dall, the Atka Littor- 

 rine. It is a large shell, 20 mm. Fig. 197, x 5 (*) 



Fig. -196, X § (*) 



