156 



WEST COAST SHELLS 



Fig. 138. X i (*) 



The shell has 



'frilonofusi/s he- 

 rend eeni, Dall, the 

 Nine - whorled 

 Spin die -shell, is 

 shown in Figure 

 138. This species 

 is an inhabitant of 

 more northern wa- 

 ters, having been 

 obtained at various 

 places in the far 

 north, and it grows 

 to a length of 

 nearly three inches, 

 about nine whorls and is very sym- 

 metrically shaped. Its color is pink- 

 ish white with a yellowish tinge be- 

 neath, and over all is a pale olive periostracum. 

 There are several other species of this genus, and they 

 all prefer the cold waters of the north to the more 

 temperate regions farther south. 



In Figure 139 we have a natural-sized picture of 

 the little Macron lividus^ A. Ad., the Livid Macron. 

 The shell is somewhat brownish in color, and when 

 found living, it will be noticed that it is covered 

 with a dark brown epidermis, which is laid on in 

 little ridges, resembling a coating of fine, 

 soft cloth. Near the top of the white co- 

 lumella is a sharp ridge. This species is 

 seldom seen far north of San Diego, while 

 another shell. Macron Kellettii^ A. Ad., 

 Fig. 139 Kellett's Macron, is commonly found on 



Fig. 137. X f (*) 



