210 Bulletin, Vanderhilt Marine Museum, Vol. Ill 



The first abdominal segment is seven-eighths as long as the seventh 

 thoracic segment; the second abdominal segment is three-fourths as 

 long as the first segment ; the third abdominal segment is subequal to 

 the second; the fourth abdominal segment is abruptly narrower and 

 only two-thirds as long as the fourth segment, and bears at its external 

 postlateral angles the longest pair of uropoda, which have the slender, 

 divergent pedunculate article rod-like, twice as long as the fifth seg- 

 ment; the inner blade the larger, one-third as long as the peduncle, 

 lanceolate, the tip acute, the outer margin nearly straight, the inner 

 lateral margin very convex; the outer blade is similar to the inner 

 but only two-thirds as long; both have a decided concavity on the 

 upper surface. The sixth segment is not quite half as long as the 

 fifth segment and slightly narrower, and bears at its outer angle the 

 shortest pair of uropoda, which are of similar shape and structure to 

 the largest pair, but are only about two-thirds as long as the first 

 uropoda; the third or medium-size pair of uropoda are about equal 

 in length and similar to the first pair, except that the distal blades are 

 nearly equal ; the outer being slightly the longer, as is also the case in 

 the shortest uropoda; the median uropoda arise from the postero- 

 distal angle of the terminal segment. 



The first, second and third abdominal segments have the pleopoda 

 w'ell developed, subequal, each with the peduncular article enlarged, 

 forming a broad, suboval side-plate, which is broadest distally and 

 terminates anteriorly in a slight process at the base of the distal 

 article ; the distal branch is scarcely two-thirds as long as the peduncle, 

 biramose, the blades being subequal, narrow, tapering to a subacute 

 apex, convex on the anterior surface and marked transversely with 

 twenty or more lines indicating annulation; the lateral and espe- 

 cially the distal margins are heavily fringed with close-set, plumose 

 setae. 



Legs : The first and second thoracic legs are weak, the dactyl short, 

 curved, inner margin finely denticulate ; there is an ovate, denticulate 

 process arising from the posterior distal angle of the propodus and 

 extending nearly one-third the length of the dactyl. 



The third and fourth legs are subequal, slender, much elongated, 

 exceeding the length of the second by slightly more than the length 

 of the dactyl of the third leg. The propodus and dactyl of the third 

 and fourth legs are much elongated, the propodus slender, subequal in 

 length to the dactyl, which is a very curved blade, acuminate-tipped. 



The fifth leg is chelate, much enlarged, about as long as the fourth 



