2l6 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



longer than first; third and fourth joints equal in length and each 

 ahout twice as long as first. Second antennae with first joint 

 very short; second, third, and fourtl* joints subequal ; fifth joint 

 a little longer than the fourth; flagellum made up of five joints 

 and exceeding in length the last two joints of the peduncle. 



Thoracic segments subequal in length and broader than its 

 mid-dorsal length; first segment broadly excavated for head. 

 Coxal plates distinctly marked off from their segments except the 

 first pair; last four pairs produced behind into acutely pointed 

 processes. First three pairs of legs subchelate, with propodus 

 swollen and dactyl short and reflex ; last four pairs of legs ambu- 

 latory and similar in form and increasing in length to the sixth 

 which is the largest ; all the legs with abundant setae. 



Abdomen composed of four segments; first three quite short, 

 broadening somewhat posteriorly. Telson acutely pointed with 

 lateral sutures of at least one more coalesced segment; lateral 

 margins near extremity denticulated, converging for their anterior 

 half gradually, and then more rapidly to the apex. Opercular 

 valves ciliated along postero-external margin, in two parts, the 

 small terminal part representing the outer ramus of the uropods ; 

 inner ramus attached to peduncle on the external side. 



Its color in life is variable but usually dark grayish. There 

 may be a mottling of light yellowish gray at the sides of the head 

 and body. 



Length 12-15 "'*'''''• 



Distribution : Florida ; New Haven, Connecticut ; Long Island 

 Sound; Woods Hole, Provincetown, Nantucket, Nahant, Massa- 

 chusetts; Vineyard Sound; Halifax, Nova Scotia. 



This species is common on sand beaches at many localities on 

 the New England coast and Long Island Sound. It is usually 

 found below high-tide mark or burrowing just beneath the sur- 

 face throwing up a little ridge like a mole, and making a little 

 mound at the end. It swims with ease. It is distinguished from 

 the following species by its large size and shorter second antennae 

 which are but little longer than the first pair. From other New 

 England Isopoda it may be distinguished by the broad subcircu- 

 lar thorax, the articulated flagellum of the second antennae, and a 

 two-valved abdominal operculum. 



