THE CRUSTACEA OF NEW JERSEY. 239 



Asellus communis Say. 



Pirate T2. 



Water Asel. 



Asellus commums Say, Journ. Acad. Nat. Sci. Phila., I, 1818, p. 427. Our 

 fresh waters. Schuylkill ivater, Philadelphia. 



De Kay, N. Y. Fauna, Crust., VI, 1844, p. 49. New York. 



White, Cat. Crust. Brit. Mus., XXV, 1847, p. 96. United States (Say's 



material). 



S. I. Smith, Rep. U. S. F. Com., II, 1872-73 (1874), p. 657. PI. i. fig. 4- 



(Philadelphia, Pennsylvania; Connecticut; Massachusetts; Michigan.) 



Underwood, Bull. 111. Lab. N. Hist., II, 1886, p. 358. New York 



and Pennsylvania. 



■ Stebbing, Hist. Recent Crust. (Intern. Sci. Series LXXIV), 1893, p. 



377. (New England, on Harger). 

 — — — ■ H. Richardson, Amer. Nat., XXXIV, 1900, p. 297. (Pennsylvania. 



Indiana, Illinois, Michigan, Mississippi.) 



H. Richardson, Proc. U. S. Nat. Mus., XXIII, 1901, p. 551. (Schuyl- 

 kill River, Pa. ; Massachusetts ; Connecticut : Indiana ; Illinois ; Michi- 

 gan; Mississippi; New York.) 



Paulmier, 58th Rep. N. Y. State Mus., IV, 1904, p. 178, fig. 50. New 



York City. 



H. Richardson, Bull. U. S. Nat. Mus., No. 54, 1905, p. 420, figs. 472 to 



473- (New York, Pennsylvania, Virginia.) 



M. J. Rathbun, Occas. Papers Boston Soc. N. Hist., VII, 1905, p. 43. 



(New England.) 



Description. — Body three times longer than wide, oblong, ovate, 

 and sides nearly parallel. Head width twice its length, narrower 

 in front than behind and with front emarginated slightly. Eyes 

 composite, small, rounded, placed laterally or at sides of head 

 midway between front and hind edges. First antenncie with basal 

 segment wide, short, reaching end of second segment of second 

 antennae. Second segment of first antennae one and one-half 

 times longer than first segment, and third segment three-fourths 

 length of second. Flagellum formed of fourteen segments, and 

 reaches end of peduncle of second antennae. Second antennae 

 with first three segments short, subecjual, fourth segment long as 

 combined length of first three, and fifth segment one and two- 

 thirds longer than fourth. Flagellum formed of about ninety 

 segments, and reaches hind edge of fifth thoracic segment. 



