No. 26.] ARTHROSTRACA OF CONNECTICUT. 63 



half the length of body, last segment of peduncle shorter than 

 preceding one. 



First pair of coxal plates widened distally and extending as 

 far forward as the eyes. Propodus of first gnathopods oblong 

 and not as wide as carpus, but about as long. Second gnathopods 

 with very elongated carpus and propodus only half as long as 

 carpus. 



First and second pereiopods with dactyl considerably longer 

 than the two preceding joints combined. Last pereiopod with 

 basal joint broadly rounded below; ischium broader than long; 

 merus produced into a pointed setose lobe at lower posterior 

 angle; carpus heart-shaped with three long ciliated setae on pos- 

 terior angle, which is more produced than the corresponding an- 

 terior one ; propodus oblong, tapering distally, and scarcely 

 longer than the two preceding joints combined; dactyl about as 

 long as propodus. 



Third abdominal segment having the postero-lateral angle 

 with a long, acute, slightly upturned projection, above which is 

 a rounded sinus followed by a rounded lobe. 



Terminal uropods with rami broadly lanceolate and about 

 twice as long as peduncle; second pair with outer ramus some- 

 what shorter than inner and armed near the tip with a very 

 long slender spine. Telson oblong oval, about twice as long as 

 broad, deeply cleft, with four pairs of dorsal denticles and a 

 single pair of apical spines. 



Color whitish. 



Length 15 mm. 



Distribution ; Arctic regions ; Greenland ; Labrador ; Iceland ; 

 British Isles ; Casco Bay, Maine ; Cape Ann, Woods Hole, 

 Massachusetts ; Newport, Rhode Island ; North of Fishers Island 

 in 3^-5 fathoms, Noank and New Haven (S. I. Smith), 

 Connecticut. 



The species seems to be confined almost entirely to muddy 

 bottoms and is abundant in eel-grass. 



Ampelisca limicola (Stimp.), recorded by Verrill (Am. Jour. 

 Sci., ser. 3, vol. 10, p. 38) from the Noank region, is probably 

 this species, according to an unpublished drawing of A. limicola 

 by S. I. Smith. 



The individuals of this species agree with Holmes's descrip- 

 tion and dififer from Sars's figures of Norwegian specimens in 



