No. 26.] ARTHROSTRACA OF CONNECTICUT. 135 



triangular process proximal to which are two smaller ones ; pro- 

 podus twice as long as wide, tapering slightly, posterior margin 

 very irregular, bearing several rounded prominences ; dactyl long 

 and slender. Second gnathopods with basal joint irregularly oval 

 in form with front margin crenulated; carpus long and slender, 

 rectangular; propodus subrectangular, slender, not as long as 

 carpus, palm slightly oblique; dactyl short; carpus and propodus 

 densely setose. 



In female: first gnathopods not as strong as in male; carpus 

 broadly oval; propodus suboval, slightly longer than carpus but 

 narrower, palm straight, oblique, with prehensile spine. 



Third pereiopods very short, fourth and fifth increasing in 

 length and with basal joints expanded. 



Coxal plates lower than their respective segments; first pn> 

 jecting well forward to form a slender triangular process. 



First pair of uropods extending as far posteriorly as last pair, 

 with the peduncle and subequal rami provided with stout spines 

 on dorsal margin; rami styliform and equal in each case to the 

 peduncle in length. 



Telson broadly oval, slightly longer than broad and with 

 rounded apex provided with a group of three spines at the 

 postero-lateral angle. 



Body densely variegated with a dark brownish pigment. 



Length 8 mm. 



Distribution : European coast from Norway to the Mediter- 

 ranean; Provincetown (Rathbun) ; Woods Hole, Massachusetts; 

 Vineyard Sound; New Haven (Smith), Noank, Noank Harbor, 

 Connecticut ; Long Island Sound. 



The species occurs among hydroids and algae, on piles and in 

 eel-grass. A few specimens in the collections studied, had been 

 taken at the surface, Noank Harbor, in the evening, July 13, 1874. 



Microdeutopus damnoniensis (Bate). 



1856. Lembos damnoniensis, Bate, Rep. Brit. Assoc., Meet- 

 ing 25, p. 58, pi. 17, fig. 9. 



1903. Microdeutopus damnoniensis, Holmes, Amer. Natural- 

 ist, vol. 37, p. 290. 



1905. Microdeutopus damnoniensis, Holmes, Bull. U. S. Bur. 

 Fish., vol. 24, p. 515. 



