128 Bulletin Vanderhilt Marine Museum, Vol. VI 



length of the third peduncular article. The flagellum has the 

 shorter, thicker branch about three-fourths as long as the pe- 

 duncle. The longer, slenderer branch is twice the length of the 

 short one. The antennal scale is lanceolate-acuminate with its 

 triangular apex projecting outside of the second peduncular article 

 for about one-third of its length. 



Antennae with the peduncular joint produced to an acute tri- 

 angulate point beneath and supporting the scaphocerite ; the 

 second article is very short, subcylindrical ; the third article elon- 

 gated, cylindrical, extending to the distal spine of the scapho- 

 cerite ; the flagellum is nearly one and one-half times as long as 

 the carapace. The scaphocerite is stylus-like, with the outer por- 

 tion thickened, apex acute, separated on the inner side by a slight 

 incision from the narrowed, slopingly rounded inner portion ; this 

 latter becomes wider toward the proximal end and is fringed dis- 

 tally and laterally by long setae. 



The external maxillipeds are pediform, the opposing halves 

 being obliquely appressed, with the inner lateral margin very 

 setose; the distal article tapered, extending definitely beyond the 

 peduncle. 



The lesser great cheliped is the longer ; has the ischium small, 

 cup-like, supporting the merus, which is trigonal, excavate on 

 the ventral or lower face; the outer lateral surface small, distal 

 margin rather deeply excavate for the reception of the rounded 

 end of the carpus; the upper margin of the merus is produced 

 distally to a slight point above the distal excavation ; the carpus 

 is short, very convex on the upper and outer surface and pro- 

 duced to a small point at the upper inner distal angle; on the lower 

 part of the carpus, outside and below the convex portion, and 

 separated from it by a sulcus, is an area which bears a strong 

 median constriction and the portion anterior to this is produced 

 into a laminate support for the lower proximal part of the palm. 

 The propodus, including the fingers, is one and two-thirds times 

 as long as the carapace and the palm is three-fifths of this total 

 length, laterally compressed, yet moderately thick, the greatest 

 height, which is across the proximal portion, is two-fifths of the 

 palm length; the upper proximal portion is produced backward 

 into a rounded node; the upper and outer lateral surface of the 

 proximal area circumscribed by a distinct groove. The upper distal 

 margin of the palm is abruptly truncated above the base of the 



