THE CRUSTACEA OF NEW JERSEY. 433 



maxillipeds with fourth joint well developed, and usually third 

 also, fifth articulating usually at apex or at front inner angle of 

 fourth. Chelipeds in adult male small or moderately developed. 

 Walking legs slender, seventh joint styliform, unarmed. Pleon 

 of male generally not covering whole width of sternum between 

 last pair of legs. 



These crabs are easily distinguished by their membranaceous 

 bodies, often soft, small eyes, and small size. They often inhabit 

 the shells of bivalve mollusca, the tests of echini, or the tubes of 

 marine worms. Species belonging to but two genera have as yet 

 been found in New Jersey, but as several others have been 

 found in the same faunal province it is likely that they may also 

 be recorded in the future. 



Key to the genera. 



a. Carapace flat, suborbicular, truncate behind; eyes large (for family), 



each eye-stalk long as half width of front. zaops 



aa. Carapace convex ; eyes small. pinnotheres 



Genus ZAOPS M. J. Rathbun. 



Zaops M. J. Rathbun, Amer. Nat., XXXIV, 1900, p. 590. Type Pinnotheres 

 depressum Say, virtually monotypic. 



Carapace flat, suborbicular, truncate behind. Eyes large (for 

 family), each eye-stalk as long as half width of front. 



Zaops depressa (Say). 



Pinnotheres depressum Say, Journ. Acad. Nat. Sci. Phila., I, 1817, p. 68. Egg 



Harbor, New Jersey (in common oysters?). 



Kingsley; Proc. Acad. Nat. Sci. Phila., 1878, p. 323 (name only). 



Zaops depressa M. J. Rathbun, Amer. Nat., XXXIV, 1900, p. 590. Virginian 



province (Cape Cod to North Carolina). 

 Pinnotheres ostreum (part) De Kay, N. Y. Fauna, Crust., VI, 1844, p. 12 



(remarks). 



Description. — Thorax flat, polished, with edge raised line of 

 very short dense hair, which broaden behind, straightened over 

 eyes and almost absent on carapace. Latter advanced, truncate. 

 28 MU 



