144 



WEST COAST SHELLS 



ently given to a Peruvian shell in 1835, which the 

 year before had been called M. orient alls ^ Gray. 

 Another similar shell from the west coast of Mexico 

 is named M. fultoni, and still another from San 

 Pedro Bay is called M. lowei^ Dall. They all have a 

 general resemblance and perhaps a common ances- 

 try. M. idc£ is named for Mrs. Ida S. Oldroyd of 

 Long Beach, who has done so much for the science 



of shells. 



Mitromorpha aspera^ Cpr., the 

 Rough Miter- form, Figure 116, is 

 really only five millimeters in 

 length, but the greatly enlarged pic- 

 ture brings out the details finely. It 

 has a brownish surface, and is 

 marked with a very distinct sieve- 

 like network of fine lines. 



Mitromorpha filosa^ Cpr., the 

 Threaded Miter-form, is shown in 

 Figure 117. The little shell is 

 about a quarter of an inch in length, 

 and it is almost black in color. Very 

 distinct spiral lines run around it, 

 giving it a threaded appearance. 



Fusinus kobelti^ Dall, Kobelt's 

 Spindle-shell, is beautifully shown 

 in Figure 118. It is very graceful 

 in form, and occasionally it grows 

 to the size of the picture, though 

 usually it is not over two inches in 

 length. There are five or six 

 whorls, with nine elevations on each Fig. 117, x s (*) 



Fig. 116, X I (*) 



