No. 26.] ARTHROSTRACA OF CONNECTICUT. 75 



jointed in female, with first joint as long as second, third, and 

 fourth together. 



Coxal plates of first and second gnathopods rectangular, 

 higher than wide, with several long setse on posterior portion of 

 lower margin. 



Gnathopods of same form except the carpus of first is longer 

 than that of second; propodus of second slightly longer than that 

 of first, oblong in form but slightly broader distally, palm oblique 

 and convex, separated from hind margin by prominent triangular 

 process and spine; carpus with three setae on hind margin. 



Third pereiopod with basal joint broader proximally than 

 distally and with front margin slightly concave ; fourth pereiopod 

 about one-half as long as body, basal joint provided with 

 numerous setse on anterior margin; fifth pereiopod with basal 

 joint as long as rest of limb and as broad as long, posterior 

 margin strongly convex and finely serrate. 



Postero-lateral angle of third abdominal segment narrowly 

 rounded. 



Uropods biramous with rami narrowly lanceolate. In 

 female, terminal uropod with inner ramus scarcely half as long 

 as outer, second joint of outer less than half the length of first; 

 in male, rami nearly equal, plumose, outer ramus with three spines 

 on outer margin. Telson much longer than broad, cleft to the 

 base, narrowed distally, with two spines -and a seta on each 

 rounded apex. 



Color light buff or orange. 



Length 5 mm. 



Distribution: Arctic regions; North Atlantic coast of Europe; 

 Greenland; Labrador; Grand Manan; Bay of Fundy; Casco Bay; 

 Vineyard Sound in deep water (Smith) ; Newport, Rhode Island; 

 Long Island Sound. Low water to 45 fathoms. 



Paraphoxus G. O. Sars. 



Hood evenly vaulted, not carinated. 



Antennae in female nearly equal-sized ; second ones in male 

 not very elongated, flagellum very slender, provided with calceoli. 



Mandibles with very poorly developed molar tubercle; palp 

 extremely slender. First maxillae with palp larger than in Phoxo- 

 cephalus but &t441-uniarticulate. Second maxillae with inner lobe 

 bi.-. '■ ■ ,.. - ■ 



