No. 26.] ARTHROSTRACA OF CONNECTICUT. Ill 



joints of peduncle subequal in length; flagellum stout, not as 

 long as last two joints of peduncle together. 



First four coxal plates deep with lower anterior margins pro- 

 vided with setae; first coxal plate not produced anteriorly. 



First gnathopods smaller than second; carpus triangular, 

 with posterior margin armed with long set^ ; propodus oval, 

 narrower distally, palm oblique and irregular and armed near 

 middle with stout spine and at prehensile angle with numerous 

 short spines ; dactyl curved. Second gnathopods of same form as 

 first but the propodus is slightly broader and has a less oblique 

 palm which bears a stout spine at middle and several short spines 

 at prehensile angle. Female with propodus of both gnathopods 

 less stout than in the male and of nearly similar size and shape. 



Pereiopods sl^ider; first and second pairs with only a few 

 spines but with numerous setae which are especially abundant on 

 the posterior margins of merus and carpus. Third, fourth, and fifth 

 pairs with basal joints oval and armed with short setae on front 

 and hind margins. 



Second and third abdominal segments with postero-lateral 

 angles produced slightly to form an acute angle and with lower 

 margins armed with short spines. Fourth, fifth, and sixth 

 abdominal segments with median fascicle of spines on posterior 

 dorsal margin ; fifth and sixth segments also with lateral fascicles 

 of spines. 



Uropods biramus ; last pair elongated and projecting well 

 beyond others ; rami narrowly lanceolate with margins abundantly 

 provided wath long plumose spines, outer ramus biarticulate, and 

 armed on outer. margin also with a number of spines ; inner ramus 

 extending as far as first joint of outer ramus; peduncle armed 

 distally with several long spines. 



Telson with a variable number of spines on lateral margins 

 and apically, cleft nearly to base and with lobes widely dehiscent. 



Length 15 mm. 



The species is found abundantly at times on the surface. 

 According to Miss Rathbun, it occurs also under stones and in 

 rock weed above low-water mark and from the surface to depths 

 of 13 fathoms. 



It is found along the New England coast from Eastport, 

 Maine to New Haven, Connecticut. Within the limits of Con- 

 necticut the species has also been taken off Fishers Island. 



