104 



Length one and three-tenths of an inch. Breadth two inches. 

 Inhabits the coast of the United States. Cabinet of tbe 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 

 footj 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 

 mercenaria.^ 



Anatina papyratia. — 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 costatus. — 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 ; g, strong, broad, elevated line within 

 passes from the hinge towards the base and becomes obsolete near 

 that part ; color pale violaceous, with about three whitish rays. 



Breadth one inch and a half. Inhabits Grreat Egg Harbor, New 

 Jersey. Cabinet of the Academy. 



Rather rare, I have obtained but few and incomplete specimens. 

 The internal costa is somewhat similar to that of S. Icgumen, but 

 it is much more elongated, and does not incline obliquely forward, 

 as in that shell ; it probably approaches nearest to S. minumus of 

 Tranqucbar. 



SoLEN CENTRALIS. — Shell transvcrscly oblong-oval, slightly 



