2l8 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



fourth joint as long as second; fifth joint as long as the two 

 preceding together; flagellum of about a dozen segments and 

 longer than peduncle.. 



First segment of thorax deeply excavate in front to accommo- 

 date the head. Coxal plates distinctly marked off from their 

 segments except the first pair, postero-lateral angles of last four 

 acutely produced. First three pairs of legs subchelate; first pair 

 a little shorter than second and third pairs but with much more 

 robust propodus; fourth to seventh pairs ambulatory, less spiny 

 but more setose than in preceding species. 



Abdomen composed of four distinct segments of which the 

 last one is twice as long as wide and has lateral sutures indicat- 

 ing a partly coalesced segment, setose at the acutely pointed tip. 



Color usually light reddish brown, speckled with darker, or 

 marked with dark transverse patches or bands. 



Length 9 mm. 



Distribution: Halifax, Nova Scotia; Bay of Fundy; Eastport, 

 Maine; Casco Bay; Gloucester Harbor, Massachusetts Bay; 

 Long Island Sound ; off New London, Connecticut. 



It is found to depths of 25 fathoms. It is also found on sandy 

 shores similar to the preceding species, but is rather more rare. 

 Its habits are essentially the same as those of C. cosca but it can 

 be distinguished from that species by its smaller size and its 

 much longer second antennse, which are about twice as long as 

 the first pair, as well as by its more conspicuous eyes. 



Idothea metallica Bosc. 



1874. Idotea robusta, Harger, Rept. U. S. Com. Fish, for 

 1871-2, p. 569, pi. 5, fig. 24. 



1880. Idotea robusta, Harger, ibid., for 1878, p. 349, pi. 6, 

 figs. 30-32. 



1905. Idothea metallica, Richardson, Bull. U. S. Nat. Mus., 

 No. 54, p. 362. 



Body oblong-ovate about two and one-fourth times as long 

 as wide; abdomen nearly one-half as long as whole body. 



Head wider than long, with front margin slightly excavate, 

 slightly wider behind than in front. Eyes large and round, com- 

 pound, and situated at the extreme lateral margin. 



