396 



BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



FIG. 441. EDOTEA TRILOBA (AFTER HAR- 



GER). X 10. 



EDOTEA TRILOBA (Say). 



Idotea trttoba SAY, Jour. Acad. Nat. Sci. Phila., I, 1818, p.- 425. MILNE 

 EDWARDS, Hist. Nat. Crust., Ill, 1840, p. 134. 



Jsera triloba WHITE, List Crust. Brit. Mus., 1847, p. 97. 



Epelys trilobus HARGER with VERRILL, 

 Report U. S. Commissioner of Fish 

 and Fisheries, 1873, Pt. 1, p. 571 

 (277), pi. vi, fig. 28; p. 370 (76). 

 VERRILL, Am. Jour. Sci., VII, 1874, 

 p. 135; Proc. Amer. Assoc., 1874, 

 p. 372. HARGER, Proc. U. S. Nat. 

 Mus., II, 1879, p. 160; Report U. S. 

 Commissioner of Fish and Fisheries, 

 1880, Pt. 6, pp. 358-359, pi. vn, figs. 

 42-43. 



Edotea triloba MIERS, Jour. Linn. Soc. 

 London, XVI, 1883, pp. 70-71. 

 RICHARDSON, American Naturalist, 

 XXXIV, 1900, p. 228; Proc. U. S. 

 Nat. Mus., XXIII, 1901, p. 545. 

 PAULMIER, Bull. New York State 

 Museum, 1905, p. 177. 



Localities. Egg Harbor, New Jer- 

 sey; eastern shore of Staten Island; 

 Savin Rock, near New Haven, Con- 

 necticut; Noank Harbor, Connecticut; Vineyard Sound, Provincetown, 

 Massachusetts; near Cape Cod; Gloucester; 30 miles northeast of 

 Portland, Quohog Bay, Casco Bay, Maine. 



Depth. Surface to % fathom, in low, muddy water; in eelgrass. 



Body ovate, a little more than twice as long as 

 wide, 3 mm. : 7 mm. Length of abdomen equal to 

 3 mm. 



Head produced in the middle of the front, with 

 two consipcuous tubercles, one on either side of the 

 median line and close together, situated on the 

 anterior margin. Antero-lateral angles of the head 

 prominent and produced in rounded lobes, upon 

 which the eyes are placed. The first pair of antennae 

 have the first and second articles equal in length; the 

 third article is twice as long as the second; the fourth 

 article is about two-thirds the length of the third, 

 antennae are longer than the second pair, the second antenna? reaching 

 only to the middle of the fourth article of the first pair of antennae. 

 The first, second, and third articles are short and subequal; the fourth 

 is one and a half times longer than the third; the fifth is just a little 

 longer than the fourth. The flagellum is minute, composed of one 

 article, which is one-third the length of the fifth article. When 

 retracted the first antennae extend only to the middle of the lateral 



FIG. 442. EDOTEA TRI- 

 LOBA. MAXILLIPED. 



The first pair of 



