22 
dium differs from most of the preceding clams in having lat- 
teral teeth on each side of the cardinal 
teeth, which are right under the beaks. 
The sheil is rather globular, rather 
thin, smooth and white outside, tinted 
with yellow inside, with a reddish- 
cell brown stripe or blotch on the posterior 
Fig. ot. Cardium mortoni, end. By holding a valve up to astrong 
light, delicate riblets may be seen 
through it. 
Another circular white ha is the 
Lucina dentata Wood. I have never 
found a perfect specimen, but single 
valves are occasionally cast up by the 
waves. The delicate sculpturing is 
peculiar and entirely different from 
any other species. 
At Asbury Park and along the 
northern part of the coast, a very 
pretty dark chestnut brown species, 
Astarte castanea Say, is found. 
Pig oat aka, Castadha: It is a solid little clam of a peculiar 
and very graceful form, covered with a chestntt epidermis 
outside, white within. A number of related species are found 
upon the New England coast, but I. have seen no Astarte but 
this one from New Jersey. 
Fig. 22. Lucina dentata. 
