104 
Lengtli one and three-tentlis of an incli. Breadtli two inches. 
Inhabits the coast of the United States. Cabinet of the Academy 
and Philadelphia Museum. 
This species, as well as the preceding, is known by the name 
of the Maninose or Piss clam, from the circumstance of its occa- 
sionally ejecting a sudden jet of water, to a considerable height 
above the surface of the sand, during the refluence of the tide. 
This jet may be commanded by stamping upon the sand with the 
foot, near the entrance of their dwelling ; it is sometimes brought 
to our markets, and is by many persons highly esteemed as food ; 
it is said by some to be preferable to the common clam, ( Venus 
mercenariai) 
Anatina papyeatia. — ^Shell turgid, very thin and fragile? 
transversely ovate, one valve very convex, and at the basal margin 
projecting a little beyond the edge of the other ; beaks not pro- 
minent, placed near one end ; surface of the valves very slightly 
wrinkled, white ; shorter margin a little gaping, and with a longi- 
tudinal wave ; tooth very oblique. 
Inhabits the southern coast. Length two-fifths of an inch. 
Width thirteen-twentieths of an inch. Thickness one-fourth of 
an inch. Cabinet of the Academy and Philadelphia Museum. 
This species does not appear to be very common. 
SoLEN CO STATUS. — -Shell transversely elongate-oval, concen- 
trically wrinkled, very much compressed, very thin and fragile, 
rounded at each end ; hinge nearly equidistant from the posterior 
termination of the shell and the middle of the hinge margin ; 
teeth two, sometimes none, in each valve, the posterior one upright, 
the other inclining forward ; a strong, broad, elevated line within 
passes from the hinge towards the base and becomes obsolete near 
that part 3 color pale violaceous, with about three whitish rays. 
Breadth one inch and a half. Inhabits G-reat Egg Harbor, New 
Jersey. Cabinet of the Academy. 
Bather rare, I have obtained but few and incomplete specimens. 
The internal costa is somewhat similar to that of S. legumen, but 
it is much more elongated, and does not incline obliquely forward, 
as in that shell 3 it probably approaches nearest to S. minkmis of 
Tranquebar. 
SoLEN CENTRALIS.— Shell transversely oblong-oval, slightly 
