and Shells of Massachusetts Bay. 85 
taken in the neighborhood of Cape Ann. I know of none 
analogous except C. crinitus, Penn., C. tunicatus, Woon, 
Gen. Conch., and C. vestitus, Bron. and Sow., Zool. 
Jour. IIl 368. The first of these has long been con- 
sidered rather doubtful, having been seen by no person 
but Pennant himself, who briefly describes itas ** C. with 
7 valves, thick set with short hairs, five eighths of an inch 
long." The figure given by him, Brit. Zool. vol. 1v, pl. 
36. fig. 1, has but little resemblance to our species and 
is referred by Des Hayes, in his late edition of Lamarck, 
to C. fascicularis, Lin. 
. . C. tunicátus, Woon, has considerable likeness to ours; 
. when the latter has lost the downy coating of the integu- 
ment, but it is more than five times its size, and without 
its elevated central area. C. vestitus, Bnop. and Sow. 
is described by them as “ C. valvis reniformibus, mem- 
branà coriaceà vestitis, apicibus nudis. Long. sixteen 
tenths, lat. nine tenths of an inch. Hab. Oceano Arc- 
tico." In their observations they remark, ‘the rather 
elevated points of the valves are alone visible, but when 
the coriaceous membrane which covers them is dry, their 
edges are easily traced. Little bunches of brownish 
hairs are scattered over the surface." I feel persuaded 
that this is distinct from our species, from the cireumstance 
that neither the peculiar cordiform granulation in the 
centre of the valves, nor the equally singular emargina- 
tion of the posterior one, are alluded to by the describers, 
It is difficult to believe, that if these remarkable charac- 
ters had existed in C. vestitus, they would have escaped 
the notice of such observers. Where they speak of the 
edges being * easily traced,” it is evidently those we the 
valves, and not of their “rather elevated points,” to 
which they refer. 1t may also be observed, en eli, 
that C. vestitus, is full twice the size of our shell. 
