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



Fig. 52. Corophium cylindricum. 



Antennae stout in female, first pair nearly as long as second 

 pair, less than one-third as long as body. First antennae with first 

 joint of peduncle very stout and slightly longer than second, pro- 

 vided with several stout spines on lower margin, third joint one- 

 half as long as second; fiagellum as long as second and third 

 joints of peduncle together, and made up of about six rather long 

 segments. Second antennae very stout, pediform, especially in 

 the male; second and third joints only slightly longer than broad, 

 third joint with four stout spines distally, fourth and fifth joints 

 subequal in length in the female and each about as long as first 

 two joints together, and provided with a few stout spines. In 

 male the lower margin of penultimate joint is produced distally 

 to form a curved, finger-like process. Fiagellum very short and 

 stout and made up of three joints terminating in two curved 

 spines. 



First gnathopods with coxal plate produced anteriorly and 

 tipped with three setae; carpus rectangular and slightly longer 

 than propodus, with hind margin provided with long plumose 

 spines; propodus widening a little distally, subchelate, palm 



