Y2 Notes on North American Crustacea. 



tory feet rather slender, smooth. Last pair of feet much longer than 

 penult pair. Penult joint of abdomen in the male elongated and slen- 

 der ; terminal joint longer than broad ; none of the joints soldered. 

 Length of carapax, 1-30 ; breadth, 1"28 inch. 



It carries a covering which is usually larger than itself, and 

 may be either a compound ascidian, or a zoanthoid polype. 



Found at St. Thomas, by M. Eiise ; at Key Biscayne, Flo- 

 rida, by G. "Wurdemann ; and at the Tortngas, by Dr. AVliite- 

 hurst. 



It appears to be a common species, and I have seen it in 

 most cabinets labelled D. lator^ M.-Edw. That species, how- 

 ever, belongs to Milne-Edwards' first division, in which the 

 carapax is broader than long. 



Hypoconcha arctiata, nov. sp. 



Front margin of carapax regularly arched, nearly semicircular in out- 

 line ; much more broadly rounded than in H. sahulosa, Guerin. There 

 are slight notches on this margin at the insertion of the antennse, but 

 no notch at the middle, where there is, however, a deep fissure. The 

 front margin is also minutely spinulose and densely ciliated, but not 

 sparsely toothed as in Guerin's species. The lower surface of the facial 

 region, maxillipeds, and chelipeds are everywhere uniformly granulated ; 

 but the granules of the chelipeds are rather finer than those of the facial 

 region. The fingers are toothed, but the teeth are much shorter than 

 in H. sahulosa. The last two joints of the female abdomen are minutely 

 granulated, but not tuberculated. Length of carapax in the female, 

 0*235 ; breadth, 0*257. In one specimen the dimensions were nearly 

 twice as great. 



Found on the sandy shores of South Carolina, by Lieut. 

 Kurtz ; and at St. Thomas, by A. H. Eiise. 



The genus is a remarkable one, and was first instituted by 

 Guerin, in 1854, for the Cancer sabulosus of Herbst, known to 

 travellers, more than a century ago, as the " Faux Bernhard 



