74 Bulletin, Vanderhilt Marine Museum, Vol. Ill 



more than half as wide and long as the second and has its antero- 

 lateral margins narrowly rounded, its postlateral margins convergent. 

 The second, third, fourth and fifth segments are subequal ; each has its 

 lateral margin separately rounded and heavily fringed with long, 

 plumose setae ; the sixth segment is narrower than the fifth and has its 

 lateral process slender, narrow, acuminate, excavate for the reception 

 of the peduncle of the rhipidura. The telson is subtriangular, with 

 the lateral and posterior margins rounded; it consists of a short, 

 proximal median triangular plate, which has the lateral contour sinu- 

 ate, and a pair of lateral lobes, which surround and project beyond the 

 median plate; each lateral lobe is traversed by a pair of sinuate su- 

 tures, which extend from opposite the inner distal margin inward to 

 the suture around the median lobe. There is also a posterior pair of 

 sutures, which extend inward a little obliquely to the median mem- 

 branous area, which is just posterior to the apex of the median proxi- 

 mal plate ; this median membranous area continues as a median line 

 separating the lateral lobes; there is also a clear-cut median incision 

 separating the convex margined lateral lobes. Thus the telson is 

 composed of a proximal median plate, which is surrounded by two 

 lateral lobes, each of which is broken by sutures into three parts, 

 giving the telson the appearance of being composed of seven plates. 

 The rhipidura have the peduncle broad and short, with its outer mar- 

 gin cut into three unequal lobes, of which the most anterior is small 

 and acuminate ; the median larger and subangulate ; the posterior 

 as large as the other two taken together and broadly rounded; the 

 inner blade is longer and is elongate-oval, with its distal margin 

 broadly rounded, finely crenulate and heavily fringed with long, 

 plumose setae. 



The chelipeds are slightly unequal, the left being the larger. Each 

 cheliped is broad and flat, with the three proximal joints small, the 

 merus short and broad distally, trigonal, with a single small spine on 

 its posterior distal margin, also a small spine on its ventral anterior 

 distal margin; there is also a subdistal, curved, transverse rugae on 

 the dorsal surface of the merus ; the carpus is three-fourths as long as 

 the maximum width of the carapace and is trigonal, its upper surface 

 being relatively flat and covered with small rugae ; the anterior mar- 

 gin is armed with three teeth; the distal dorsal margin is sinuate, 

 armed with two or three spines; the dorsal posterior lateral margin 

 is accentuated by a longitudinal series of six or seven forward-point- 

 ing spines ; the anterior lateral face of the carpus is slightly excavate, 



