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



First antennae widely separated at the base, with the first joint 

 short and stout ; second longer and tapering ; third about as long 

 as first; flagellum longer than peduncle, tapering, five-jointed. 

 Second antennae as long as first pair; first two joints short and 

 stout; the next three joints more slender; flagellum of three or 

 four joints. 



First thoracic segment longest ; next three a little shorter and 

 equal; fifth and sixth still shorter; and seventh the shortest. 

 Coxal plates narrow and obtusely pointed behind, but not ex- 

 tending beyond the posterior angle of their respective segments 

 except in the last two. First pair of legs short and stout; suc- 

 ceeding legs increasing in length posteriorly. 



Abdomen tapering rapidly at the sides; first five segments 

 subequal in length; last segment as long as five preceding seg- 

 ments, flat and broadly rounded behind. Uropods surpassing 

 telson, with basal segment as long as rami and only slightly 

 produced at inner angle; outer ramus linear oblong, rounded at 

 end, inner ramus shorter and broader, oblique at the tip. 



Length 17-22 mm., breadth 10-12 mm. 



Distribution: Mobile, Alabama; Biloxi, Mississippi; Florida; 

 Charleston, South Carolina ; Virginia ; Baltimore, Maryland ; New 

 York; Long Island; New Haven, Thimble Islands, Connecticut; 

 Woods Hole, Massachusetts; Vineyard Sound. 



This species is parasitic on the blue fish, saw fish, scup, sea 

 trout, sun fish, etc. It is attached usually to the gills and roof of 

 the mouth. 



LIMNORIIM:. 



Body subdepressed and capable of being rolled into a ball. 

 Head short and very convex. 



Antennae small, subequal in size. 



Mouth parts normal, adapted for biting. 



Coxal plates behind the first segment of thorax distinct and 

 laminar. Legs of uniform structure, ambulatory in function. 



Abdomen composed of six well defined segments, the last of 

 which is very large and shield-shaped. Uropods comparatively 

 small, lateral; rami not lamelliform. 



