THE CRUSTACEA OF NEW JERSEY. 271 



Genus ANCINUS Milne-Edwards. 



Ancinus Milne-Edwards, Hist. Nat. Crust., III. 1840, p. 225. Type "Ncesa 

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



Characters included 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, Nezu Jersey. 

 ■ ^ — De Kay, N. Y. Fauna, Crust., VI, 1S44, p. 45 (on Say). 



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



CaroHna 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 antenuce. First antennas 

 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, formed 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 any vestiges of an outer 

 branch. Length 12 mm. 



