HORN-MOUTH. 
21 
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 ribs, 
from which it receives its name. The common 
color is reddish yellow, but it shades through 
brown to black. 
Am.ycla 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 ITorn- 
month. 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 
