224: Notes on North American Crustacea. 



near to tlie base of the dactylus, whicli is ciliated above with 

 long reddish hairs; hinge-tubercle, and most of the teeth on the 

 inner sides of the fingers, bright carmine. Dactyli of the first 

 three pairs of ambulatory feet very broad and flat for the 

 genus, but with the sulci not entirely obscured. 



This species is easily distinguished by the shortness of its 

 lateral spine or posterior tooth of the antero-lateral margin, 

 which is no larger than that in front of it. 



Aclielou!!i ordi^ayi, nov. sp. 



Carapax pubescent, sparsely granulated toward the antero-lateral 

 margins ; granules acute and of a red color. Front very prominent, and 

 rather narrow, with four very sharp and prominent teeth. Antero- 

 lateral margin nine-toothed, the posterior tooth twice as long as the 

 next before it. Meros-joint of the external maxillipeds more prominent 

 at its antero-exterior angle than is usual in the genus. Chelipeds with 

 long and sharp spines, in the usual positions ; hand rather short, with 

 the supero-exterior surface in parts smooth, bare of pubescence, and highly 

 iridescent; fingers long and narrow, deeply sulcated. The dactyli of 

 the first three pairs of ambulatory feet in this species are very long and 

 slender, subcylindrical, much narrower than in any other known species 

 of Portunidae, and deeply sulcated. Color of the crab, pale reddish or 

 brownish, mottled ; gastric region usually deep crimson. Length of 

 the carapax in a female, 1.45 ; breadth, 2.235. 



This cannot be the Lwpa sebae of M. Edwards, as that 

 author states that in his species the posterior feet are armed with 

 a spine on the meros-joint as in Z. rubra. 



Key Biscayne, Fla., Wurdemann ; Tortugas, "Woodbury ; St. 

 Thomas, Riise. 



"We have named it after our friend Mr. Albert Ordway, of 

 Cambridge, a rising carcinologist of much promise, who is, we 

 learn, engaged upon a monograph of the Portunidae. 



