156 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



and entire and provided on either side with a minute spine and 

 one or two setae. 



The species is conspicuously mottled. The ground color is 

 reddish, the spots are of a lighter color. 



Length of large male 10 mm. 



Distribution : Nahant, Woods Hole, Gay Head, Vineyard 

 Haven, Massachusetts ; New Haven, Connecticut. 



The species occurs frequently among hydroids and algae on 

 piles but has also been collected at the surface, in tide-pools and 

 on sandy and muddy bottoms. 



I was unable to examine the specimen from New Haven 

 which was collected and identified by Dr. W. K. Longley. 



Ischyrocerus Kroyer. 



Similar to Jassa except as follows. Second coxal plates not 

 differently shaped from, third. Second gnathopods in female a 

 little larger than first; in the male with hind margin of propodus 

 not produced into a prominent decurrent tooth. 



Ischyrocerus anguipes Kroyer. 



1894. Ischyrocerus anguipes, G. O. Sars, Crust. Norway, 

 vol. i, p. 588, pi. 209. 



1874. Podocerus fucicola, Smith, Rep. U. S. Fish. Com., 

 1871-2, p. 565. 



Eyes nearly round. 



First antennae considerably shorter than second, peduncle with 

 second joint a little longer than third and nearly twice as long 

 as first; flagellum shorter than last two joints of peduncle; acces- 

 sory flagellum very small, consisting of an elongate joint tipped 

 by a very minute one. Second antennae stout and elongate; 

 peduncle with last two joints subequal; flagellum shorter than 

 last joint of peduncle and composed of five or six joints of which 

 the first is the longest. 



First four coxal plates subquadrate, and as deep as their 

 respective segments. 



First gnathopods in male small; basal joint broad; carpus 

 rounded and setose behind; propodus subovate, with palm very 

 oblique and nearly straight, posterior margin with a row of 

 spines which begins at the palm ; dactyl with inner margin finely 



