No. 26.] ARTHROSTRACA OF CONNECTICUT. 225 



the base, followed by a depression so that in a lateral view the 

 abdomen is seen to be in the form of two elevations separated 

 by a deep depression; apex of telson also separated from second 

 elevation by another depression; sides converging rapidly below 

 the middle to a narrow, pointed apex. 



Color uniform, dull, usually obscured by adhering particles 

 of dirt. 



Length 7 mm. 



Distribution : Great Egg Harbor, New Jersey ; Staten Island ; 

 Savin Rock, near New Haven, Noank Harbor, Connecticut ; 

 Watch Hill, Rhode Island; Vineyard Sound; Provincetown, 

 Gloucester, Massachusetts ; Quahog Bay, Casco Bay, Maine. 



The species occurs among eel-grass, on piles, and in sheltered 

 places among decaying vegetation and mud on the bottom, from 

 the surface to 3 feet in depth. It is usually covered with adher- 

 ing dirt.. 



It may be recognized among the native Isopods by the trilobed 

 character of the back, the abdomen of a single segment, -and the 

 second antennas with only a rudimentary flagellum. 



Edotea montosa (Stimpson).* 



1853. Idotea montosa, Stimpson, Smithson. Contrib. Knowl., 

 vol. 6, p. 40. 



1874. Epelys montosus, Harger, Rept. U. S. Com. Fish, for 

 1871-2, p. 571. 



1880. Epelys montosus, Harger, ibid., for 1878, p. 359, pi. 

 8, figs. 44-47. 



1905. Edotea montosa, Richardson, Bull. U. S. Nat. Mus., 

 No. 54, p. 397. 



Body ovate, a little more than twice as long as wide ; abdomen 

 slightly more than one-third as long as entire body. Head with 

 front margin triangularly produced and with two low tubercles 

 situated on the anterior margin. Eyes placed on the antero- 

 lateral lobes which are rounded. 



First antennae with first and second joints equal in length, 

 third joint twice as long as first, fourth joint slightly more than 

 half as long as third. Second pair of antennas extending not 

 quite as far as third joint of first pair, with first three joints 

 subequal and fourth and fifth successively longer; flagellum com- 

 15 



