CRUCIBULUM. 



77 



Closely resembling the Crepidulas, but containing 

 a triangular cup instead of a shelly deck, conies the 

 Cup-and-Saucer Limpet, Crucibulum 

 spiiiosiim, Sby., Cru-sib'-u-lum spi-no'- 

 sum, shown in Fig. 62. The saucer is 

 more or less sharply conical, usually 

 brownish in color, and set, on the out- 

 side, with numerous spines. The cup 

 within the shell is small, white and 

 Fig. 62. triangular, and on one side is joined to 



the saucer. This species assumes many forms, and the 

 shell varies in color from brown to almost white ; 

 sometimes it is quite free from spines. Diameter 

 from one-half an inch to three times that size. Its 

 home is to the south of Monterey bay. 



