l8o CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



as first with ventral margin of peduncle fringed with long setae, 

 fifth joint of peduncle the longest; flagellum as long as penulti- 

 mate joint of peduncle and composed of two segments. 



First gnathopods with very short basal joint; carpus bearing 

 a rounded lobe posteriorly which is provided with group of long 

 setje; propodus triangular, twice as long as wide, with anterior 

 and posterior margins slightly convex, palm coincident with 

 posterior margin and finely serrated, proximal angle with stout 

 spine ; dactyl long and stout with concave margin serrated. 



Second gnathopods with basal joint shorter than propodus 

 and bearing a rounded lobe at antero-distal angle; carpus very 

 short; propodus oval, tapering somewhat distally; setose palm 

 convex and nearly as long as posterior margin and demarcated 

 by a process and two spines, anterior margin strongly convex, 

 pereiopods stout ; carpus as broad as long and one-third as long 

 as propodus which has a palm nearly as long as front margin, 

 demarcated from it by a prominent projection having a spine 

 on its apex ; dactyl long and strongly curved. 



The color is very variable. Some individuals are nearly color- 

 less; others are uniformly reddish; and others mottled. 



Length, of adult male, 15 mm. 



This is one of the commonest species of Amphipoda on the 

 coast of New England. North of Cape Cod it is more rare, and, 

 according to Holmes, it has not been found at all as far north 

 as Maine; southwards it probably extends beyond Virginia. 

 Within the limits of Connecticut it has been obtained at New 

 Haven and Noank; at the latter place in eel-grass and on the 

 piles of a wharf, in sponges, etc. The species has also been re- 

 ported from the Mediterranean, Belgium, France, Great Britain, 

 Hong Kong, and Rio Janeiro. 



Caprella aequilibra Say. 



1818. Caprella wquilibra. Say, Jour. Acad. Nat. Sci. Phila., 

 vol. I, pt. 2, p. 



Body comparatively robust and perfectly smooth above, with 

 anterior part very much elongated. Head without an anteriorly 

 directed spine. 



Second gnathopods of the male with the basal joint very 

 much shorter than the propodus and attached near the posterior 



