/ 
86 
V ery numerous upon almost the whole extent of our coast. The 
spire in some specimens is much more elevatrd than in others, and 
the duplication within the umbilicus, is sometimes partially con- 
cealed by the projecting callus. 
In the collection of the Accademy of Natural Science is a 
species from Candia, presented by Mr. S. Hazzard, which very 
much resembles this, but it differs in being destitute of the black 
line, and in having the umbilicus partially covered from the side, 
leaving only a linear, semicircular, lateral opening. Another speci- 
men from India strongly resembles it, and is also marked with the 
black line, but there is only a circumscribed callus extending 
laterally, leaving a large umbilicus, and marked transversely by a 
groove. 
I formerly referred this species to iVl rugosa, but it appears to 
be a much larger species, as Dillwyn states the rugosa to be only 
ten lines long. It is probably the same species as that represented 
by Lister on plates 562 and 563, but I do not find those figures 
refered to at all by Dillwyn. 
Natica HEROS.-”Shell suboval, thick, rufo-cinereous ; within 
whitish ; columella incrassated ; callus not continued over the 
upper part of the umbilicus, hardly extending beyond a line drawn 
from the base of the collumela to the superior angle of the labrum ^ 
umbilicus free, simple. 
Length about two inches and a half. Inhabits the coast of New 
Jersey. 
I have two specimens from Great Egg Harbor. It differs from 
the preceding species in being less dilated, destitute of the black 
line of the apex, and of the much incrassated projection from the 
columella so conspicuous in that shell. This is our largest species. 
I have a specimen more than three inches in length. 
I formerly considered this to be JSF. rufa^ Gmel., but that species 
is said by Dillwyn to be only half an inch long, and he refers to 
Born, t. 17, f. 3, and 4, and also to Lister, Conch, t. 506, f. 3, 
neither of which figures resemble our species. 
