250 REPORT OF NEW JERSEY STATE MUSEUM. 

 Key to the species. 



a. Body surface tuberculated, its outline serrate; first pair of antennas long; 

 terminal segment of body with prominent lateral tooth near base on 

 either side. Uliformis 



aa. Body surface smooth throughout, its outline regular ; first pair of antennae 

 short ; terminal segment of body shows but slight traces of lateral tooth 

 near its base on either side. attenuata. 



Erichsonella filiformis (Say). 

 Pl.\te 77- 



StotosoHia ftlifonnis Say, Journ. Acad. Nat. Sci. Phila., I, 1818, p. 424. Bgg 

 Harbor, New Jersey. 



De Kay, N. Y. Fauna, Crust., VI, 1844, p. 44 (on Say). 



Idotea filiformis White, Cat. Crust. Brit. Mus., XXV, 1847, p. 96. Egg 



Harbor, New Jersey (Say's material). 

 Erichsonia filiformis Verrill, Rep. U. S. F. Com., I, 1871-72 (1873), p. 316 



(habits). 



■ Harger, Rep. U. S. F. Com., I, 1871-72 (1873), p. 570, PI. 6, fig. 26. 



Vineyard Sound to Great Egg Harbor, New Jersey. 



Harger, Proc. U. S. Nat. Mus., H, 1879, p. 160. South of Cape Cod. 



Harger, Rep. U. S. F. Com., IV, 1878 (1880), pp. 355, 434, PI- 7, 



figs. 38-41. (Long Island Sound and Say's record.) 

 Cleantis filiformis Miers, Journ. Linn. Soc. London, XVI, 1883, p. 77. Egg 



Harbor, New Jersey (Say's example). 

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



375. United States (reference). 

 Erichsonella filiformis H. Richardson, Amer. Nat. XXXIV, 1900, p. 228. 



Cape Cod to North Carolina in 4H-7 fathoms. 

 • H. Richardson, Proc. U. S. Nat. Mus., XXIH, 1901, p. 543. Great 



Egg Harbor, New Jersey. (Massachusetts, Long Island Sound and 



Florida.) 

 • H. Richardson, Bull. U. S. Nat. Mus., No. 54, 1905, p. 401, figs. 449- 



450. Great Egg Harbor, N. J. (Long Island Sound, Massachusetts, 



Florida, Bahamas.) 

 ■ M. J. Rathbun, Occas. Papers Boston Soc. N. Hist., VII, 1905, p. 42. 



(Long Island Sound, Maine. Massachusetts.) 



Description. — Body oblong, ovate, almost three times long as 

 broad. Abdomen length equals little more than one-third length 

 of entire body. Head about twice as wide as long, front deeply 

 emarginate between anterior lateral angles, and latter conspicu- 

 ous and acute. Eyes composite, large, rounded, placed medianly 



