HORN-MOUTH. 2 1 



clinging to the rocks. Such a triumph is not 

 soon forgotten. It is pleasant to gather dead 

 shells on the shore, but that is not enough ; you 

 want to find the little animal at home and see 

 how he keeps house, before you can form a cor- 

 rect notion of his peculiarities. Be not deceived 

 by the little hermit crabs which love to get into 

 dead shells and draw them around as a means of 

 defense, but search till you find the true living 

 mollusk. Amphissa corrugata sometimes grows 

 to a length of one inch, but is usually about half 

 that length. The spire consists of four whorls with 

 a plainly marked suture. Spiral striae may be 

 found at the base of the shell, above which the 

 whole surface is ornamented with wavy rils, 

 from which it receives its name. The common 

 color is reddish yellow, but it shades through 

 brown to black. 



Amyda carinata, Hds., Fig. 5, PI. Ill, is 

 about the size of a barley-corn. Its spire is half 

 the length of the shell, and consists of four 

 whorls. The body whorl has a stout keel, which 

 gives the species its name. In some varieties 

 this keel almost wholly disappears. Color, light 

 brown, with fa dark apex and canal ; surface, 

 smooth and glossy ; may be found on the beach, 

 with the last species. 



Fig. 6, PI. Ill, represents a rare and beautiful 

 shell,' Cerostoma foliatum, Gmel., Leafy Horn- 

 mouth. The fine specimen which the artist 

 used as a model was found among the rocks off 

 Pacific Grove, at Monterey. It has three broad, 

 winglike varices, or expansions, marking stages 

 in growth. These varices are made up of shelly 



