220 Bulletin, Vanderhilt Marine Museum, Vol. II 



Ocypoda arenaria Milne Edwards, Hist. Nat. Crust., vol. 2, p. 44, pi. 

 19, figs. 13 and 14, 1837.— Miers, Ann. Mag. Nat. Hist., ser 5, 

 vol. 10, p. 384, pi. 17, figs. 7-7b, 1882. 



Genus: UCA Leach. 



Uca pugnax (S. I. Smith). 



Plate 74, fig. C. 



Diagnostic characters: A small species; carapace extremely con- 

 vex from front to back; eyebrow nearly vertical. Oblique ridge on 

 the upper surface of palm very granular, terminating at the carpal 

 cavity. 



Type : The type was taken at New Haven, Conn., and is deposited 

 in the Peabody Museum of Natural History, Yale University. 



Distribution: Eastern coast of the United States, from Province- 

 town, Mass., to New Orleans, La. 



Material examined: Three males from the shores of the ''Eagle's 

 Nest," Northport Harbor, Long Island, N. Y., September 11, 1928. 



Technical description: Carapace very convex longitudinally, 

 widest across the anterior median region. Frontal border scarcely 

 two-sevenths of total f ronto-orbital width ; the superior orbital margin 

 is sinuous, quite oblique, it and the front are margined by a flat 

 carina ; the lower orbital margin is coarsely dentate ; the anterolateral 

 angle is obtuse, not produced. Anteriorly the lateral margins are 

 slightly convex and then abruptly run inward as a carinate line sepa- 

 rating the high sidewall from the dorsal surface. The dorsal surface 

 is glabrous, the H-shape depression deep; there is a pit behind the 

 median orbital margin and another on the branchial region in line with 

 the gastro-cardiac sulcus. The pterygostomian region is densely to- 

 mentose and the external maxillipeds are setiferous. The male belt is 

 seven-segmented ; the female belt is also, but is very wide, oval. 



The antennulae and antennae offer no specific characters. 



The eyestalk is slender, the cornea set obliquely terminal, oval, 

 shining black. 



The great cheliped of the male has the palm two-thirds as wide as 

 the carapace and its height is equal to two-thirds of its own width; 

 the outer face is moderately rounded, very granulose ; the upper mar- 

 gin with a distinct beading. The oblique ridge on the inner surface 

 of the palm terminates at the carpal cavity. The fingers are widely 



