and Shells of Massachusetts Bay. 65 
Ossrrvations. This species, which is very distinct, 
appears to be much rarer than the preceding, or is only 
found in a particular spot ; as in several visits to Phillips’ 
Beach, for the purpose of examining the fishes brought 
there by boats, in great numbers, I met with them but 
once, and then procured only four specimens. They 
must have been taken by the fishes, at no great distance 
from the shore, as they all contained the animal which 
was but very little decomposed. It somewhat resembles 
N. costellata, Sow. from Panama, Conch. Illus. fig. 8. 
TEREBRATULA SEPTENTRIONALIS. 
T. testA ob-ovatà, tenui, albidà, valvà majore apud apicem coarctata, 
radiatim creberrime striata, nate emarginatà, foramine magno semi- 
elliptico, margine non inflexo, denticulato 
Long. eight twentieths, lat. four twentieths, alt. ten 
twentieths, of an inch. 
Hab. coast of New England. 
My own Cabinet. : 
Cabinet of Bost. Soc. Nat. History. 
i of. A, A. Gould, M. D. 
Descriprioy. Shell obovate, thin, fragile, whitish, 
nearly diaphanous, with numerous fine, yet well marked, 
delicately granulate, radiating strie, decussated by mi- 
nute concentric ones ; the larger valve is abruptly com- 
pressed near the apex, and feebly convex ; summit emar- 
ginate, tendinal orifice large, semi-elliptical, completed by 
the minor valve, which is depressed, nearly flat and un- 
guiform ; margins without any inflexion, denticulate in 
their whole extent; the hinge is formed by two laminar 
cardinal teeth in each valve, those in the larger being 
the outermost, and in the smaller connected by a thin 
VOL. II.—NO. I. 5 
