140 Bulletin Vanderbilt Marine Museum, Vol. VI 



orbital margin very shallowly rounded, each orbit about twice the 

 diameter transversely of the base of rostrum ; a slight sulcus sepa- 

 rates the orbit from the rostrum. 



The antennulae have the peduncle with the first article two- 

 thirds as long as the second article, which is twice as long as the 

 third article; the total peduncle exceeding the length of the an- 

 tennal peduncle by four-fifths of the distal joint of the antennulae. 

 Scaphocerite with the outer margin slightly bowed, a small sub- 

 distal tooth ; the distal margin evenly rounded, fairly broad, cili- 

 ated; the inner lateral margin is convex; the scaphocerite dis- 

 tinctly widening proximally. The antennal flagellum is broken 

 off. The antennular flagellum has the inner branch a little longer 

 than the entire body, or about 45 per centum longer than the outer 

 branch ; the proximal third of the outer branch is about twice as 

 thick as the distal two-thirds, which is very fine, as is also the 

 entire inner branch. 



Carapace and body moderately slender, laterally compressed. 

 Sixth abdominal segment only one-fourth longer than the fifth 

 segment and five-sixths as long as the telson, which is dorsally 

 rounded, armed with two pairs of articulated spines and a third 

 pair of spines at the distal margin; lateral margins convergent 

 distally, distal margin truncate, narrowed, ciliate, not extending 

 quite so far as does the inner blade of the uropoda. Uropoda with 

 both blades widely oval distally, the outer one the wider and with 

 an external subdistal tooth. 



Left great cheliped (the right is missing) with the merus 

 arched, exceedingly slender, with an acute subdistal tooth on the 

 inferior lateral margin; carpus short, cup-like, with the distal 

 upper margin tri- or quadri-dentate ; propodus normally laying 

 in a horizontal position so that the true dorsal margin and upper 

 finger are on the outside and the normally ventral margin and 

 fixed finger is on the inner lateral margin. The propodus is as 

 long as the carapace and the first and second abdominal segments ; 

 and has the upper (outer) lateral margin of the palm subcarinate 

 and terminating distally in a blunt angulation, the anterior face of 

 which is flat and is opposed to a similar flat area on the proximal 

 upper surface of the movable finger. The fixed finger is bent in- 

 ward at a decided angle at its base and is one-half times as long 

 as the palm, also one-quarter longer than the upper finger. The 

 lower finger is produced on its upper side, about midway its length. 



