THE CRUSTACEA OF NEW JERSEY. 271 



Genus ANCINUS Milne-Edwards. 



Anciniis Milne-Edwards, Hist. Nat. Crust., III. 1840, p. 225. Type "Nccsa 

 dcpressa Leach" (though doubtless of Say), monotypic. 



/C^'^^6P3 V<:snO, 



Characters incluckd in those of the family. 

 A single species. 



Ancinus depressus (Say). 



Plate 81. 



Ncesa depressa Say, Journ. Acad. Nat. Sci. Phila., I, 1818, p. 483. Egg Har- 

 bor, Nezv Jersey. 



De Kay, N. Y. Fauna, Crust., VI, 1844, p. 45 (on Say). 



H. Richardson, Amer. Nat., XXXIV, 1900, p. 224. Cape Cod to North 



Carolina region. 



H. Richardson, Proc. U. S. Nat. Mus., XXIII, 1901, p. 537. Egg 



Harbor, New Jersey. 

 Ancinus depressus White, Cat. Crust. Brit. Mus.. XXV, 1847, p 105. North 

 America (Say's material). 



Stebbing, Hist. Recent Crust. (Intern. Sci. Series LXXIV), 1893, P- 366 



(reference). 



H. Richardson, Bull. U. S. Nat. Mus., No. 1905, p. 371, fig. 282. Egg 



Harbor, N. J. (Uropoda of type.) 



H. Richardson, Proc. U. S. Nat. Mus., XXXVI, 1909, p. 175. fig. i. 



(Wood's Holl, Massachusetts.) 



Description. — ^Body about twice as long- as broad, ovate. Head 

 wide, short, with rounded lateral edges and angles, and front 

 produced anteriorly in a median linguiform process extending 

 forward over basal segments of first antennse. First antenn.ne 

 with first three segments dilated and of nearly equal length. 

 Thoracic segments subequal. First abdominal segment almost 

 entirely concealed, and second or terminal segment with length 

 four-fifths basal width. Terminal segment of triangular form, 

 apex funnel-shaped, with sides turned downward and inward, 

 Uropoda single-branched, fomied as a long narrow tapering 

 branch each side, acute posteriorly, and reach to tip of terminal 

 abdominal segment. Apparently each uropod firmly and immov- 

 ably joined to abdomen, and without anv vestiges of an outer 

 branch. Length 12 mm. 



