230 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [BuU. 



Thoracic segments, each with a smaller median tubercle near 

 its posterior margin ; first two segments with lateral margins pro- 

 duced in very acute processes, one on either side of each segment; 

 lateral parts of third and fourth segments produced on each side 

 into two acute processes of which the anterior one is the larger; 

 last three segments with anterior part of lateral margin acutely 

 produced. Coxal plates distinct, that of first segment being acute 

 and anterior in its position ; that of the second being bilobed, the 

 upper division concealing the smaller acute lower one; coxal 

 plates of third and fourth segments acute but not very con- 

 spicuous ; those of the last three segments also acute and attached 

 to posterior part of segment. This condition of the coxal plates 

 and lateral margins gives the appearance of fourteen teeth on 

 each side of the thorax. Legs all more or less similar and 

 terminated by a subchelate propodus and dactyl. 



Abdomen composed of a single segment which is produced 

 on either side in an acute angular process about one-third the 

 distance from the base to the apex ; lateral margins diverging very 

 slightly behind the angular processes for one-third the length 

 of the abdomen and then converging rapidly to a triangular apex 

 which is rounded. Operculum a little more vaulted and shorter 

 than in the preceding species; basal plate less than three times 

 as long as wide, terminal plate triangular. 



Color usually dull, neutral tint without bright markings. 



Length ii mm. 



Distribution : The Bahamas ; Florida ; Great Egg Harbor, New 

 Jersey ; Long Island Sound ; Vineyard Sound ; Nantucket Sound ; 

 Fishers Island Sound; Thimble Islands and Noank, Connecticut. 

 It is usually found in tide-pools or among eel-grass and algse and 

 in sand and gravel to a depth of i8 fathoms. 



The species may be distinguished by the clavate flagellum of 

 the second antennse and the strongly serrated outline of the sides. 



ASELLOIDEA or ASELLOTA. 



First thoracic legs not cheliform; uropods terminal, biramous; 

 outer branch of pleopods never two-jointed; pleopods exclusively 

 branchial, generally covered by a thin opercular plate (the modi- 

 fied first pair). 



