CHAPTER VII 



MARINE UNIVALVES 



Fig. 99 



Myurella simplex^ Cpr., the Simple 

 Auger-shell, shown in Figure 99, is a 

 southern mollusk, having a pretty, slender, 

 conical shell. The spire winds gracefully 

 upwards and ends in a sharp point at the 

 apex, while at the other end of the shell 

 the aperture is small and ends in a short, 

 recurved canal. Following the sutures is 

 a spiral thread of beads, which adds much to the at- 

 tractiveness of the shell. The length is an inch or 

 more, the whorls are about twelve in number, and 

 the color is whitish or brown. This shell is our 

 representative of the genus ^erebra^ which has a 

 large number of species of similar form, some of 

 which are very strong and as long as your hand. 



Figure 100 also shows our repre- 

 sentative of a large genus of shells, 

 most of which are found in tropical 

 seas. Its name is Conus calif omicus^ 

 Hds., the California Cone. While 

 large and beautiful specimens of the 

 Cone-shells are found in the warm 

 waters of the Pacific and Indian 

 oceans, our little species is very hum- 

 ble, being about an inch in length, while its surface 

 is of a sombre chestnut color, though one may be 



Fig. 100 



