72 



CRUSTACEA MALACOSTRACft. II. 



more robust. Fir.st joint a little longer than the three other joints combined, a little more than two 

 and a half times as long; as deep, moderately tapering; second joint about as long as the depth of 

 first joint, moderately produced above and somewhat thick; upper margin of third joint half or more 

 than half as long as the second; fourth joint decidedly shorter than the second. — Antennse with 

 fourth joint scarcely half as long again as the fifth, as long as or shorter than the sixth. 



Chelipeds (figs. 2 a and 2e) somewhat robust; carpus a little or somewhat less than twice as 

 long as deep, with the distal half distinctly expanded downwards and the corresponding part of the 

 lower margin moderately convex. Chela slightly or a little longer than the carpus, somewhat more 

 than twice as long as broad, thus conspicuously less broad than in the three preceding species; the hand 

 is oblong but not subtriangular, its anterior margin without crenulation and about half as long again 

 as the movable finger, the distal part above the insertion of the finger flatly rounded or obtuse. The 

 margin of the movable finger and the outer side of the chela without crenulation. The fixed finger 

 with three teeth along the distal portion of the incisive margin and the last tooth cleft. 



The thoracic legs moderately slender. Second and third pairs subequal (fig. 2 b); posterior ter- 

 minal spine of fourth joint much shorter than fifth joint; sixth joint about half as long again as the 

 fifth, bnt a little or very conspicuously shorter than seventh joint with claw. Posterior pairs (fig. 2c) 

 with the sixth joint about half as long again as the seventh, which has a row of very fine and short, 

 setiform denticles. 



The five anterior abdominal segments (fig. 2d) with the median row of ventral tubercles high 

 and strong; lateral plates of sixth segment without any expansion or process. The pleopods with the 

 setEe about twice as long as the rami. — Uropods about as long as the two posterior segments com- 

 bined; the peduncle nearly twice as long as deep, more than half as long as first joint of the endopod; 

 second joint of the endopod conspicuoush' or even considerably shorter than the first; exopod a little 

 more than half as long as the first joint of the endopod. 



Length of a large female without marsupium 3.3""", of a female with marsupium 2.1"'". 



Subadalt Male. Antennulce much thicker than in the female, five-jointed, the proximal third 

 of fourth joint being set off by an articulation and somewhat thickened; the first joint is thick to the 

 end, second almost as thick as the first, and third joint rather thick. Abdomen a little longer and 

 distinctly thicker than in the female. 



Adult Male (figs. 2 f— 2 1). This description is based on the single "Ingolf specimen; Van- 

 hoffen's specimen is mentioned in 'Remarks". — Antennulse with first and second joints very thick 

 (fig. 2f); second joint is somewhat inore than half as long as the first and slightly longer than the 

 seventh, which is a little longer than the sixth; bundles of sensory setse originate from the lower 

 distal end of fourth, fifth and sixth joint.s. 



Chelipeds (figs. 2 f — 2h) somewhat robust; carpus scarcely half as long again as deep. Chela 

 not fully half as long again as the carpus, slightly more than twice as long as broad and nearly as 

 broad as the depth of the carpus; anterior margin of the hand nearly half as long again as the mov- 

 able finger, which has its incisive margin irregular!)' serrate from the base to the middle, while the 

 corresponding margin of the fixed finger is somewhat convex and ver}' finely serrate along nearly 



