, 86 



Very 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 N. rugosa,- but it appears to 

 be a much larger species, as Dillwyn states the nigosa 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 N. 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. 



