CO CRUSTACEA MALACOvSTRACA. II. 



Other joints combined; second joint considerably longer than deep; third joint conspicuously more 

 than twice as long as the second, with the longest terminal seta about as long as the joint. — An- 

 tennEe rather long; second and third joints (fig. 4c) very thick, third joint on the lower .side with three 

 strong, spiniform and nearly hook-shaped processes directed much backwards; second joint with a 

 similar process a little behind the front lower angle and sometimes besides a minute, acute denticle 

 behind the hook; fourth joint is distinctly more than twice as long as the penultimate joint, and the 

 terminal setse nearly as long as those of the antennulse. 



Chelipeds (fig. 4b) somewhat long and strong. Basal joint with the posterior protuberance 

 somewhat long and rounded behind; the distance between its hind margin and the lower front end of 

 second thoracic segment distinctly more than one-third of the length of the joint. Carpus much 

 longer than the basal joint and nearly three times as long as deep. Chela as long as the carpus and 

 little more than three times as long as broad; movable finger nearly as long as the front margin of 

 the hand; fixed finger inconsiderably thicker than the movable, with low teeth towards the end of 

 the incisive margin. 



Thoracic segments (fig. 4a), taken together, with the lateral margins parallel excepting in front 

 and behind, as the margins of second segment converge somewhat from near the front end to the hind 

 margin, while those of seventh segment converge in the opposite direction. Second segment some- 

 what or considerably shorter than the third, below a little behind the front angle with a somewhat 

 small, subacute process directed mainly forwards (fig. 4 b). Third, fourth and sixth segments nearly 

 equal in length, nearly as long as broad and only a little shorter than fifth segment. — Thoracic legs 

 somewhat short. Second pair (figs. 4b and 4d) with fourth joint distinctly longer than the fifth and 

 without setae; seta on the anterior angle of fifth joint somewhat short; sixth joint a little shorter than 

 fifth and fourth joints combined, and the seta on the anterior side stiff and only a little longer than 

 the diameter of the joint; seventh joint with claw about as long as fourth joint; the third joint on 

 the posterior side with an extremely long, strong seta reaching the end of fifth joint. Third pair with 

 the seta on third joint proportionately still longer than that on second pair; fourth, fifth and sixth 

 joints conspicuously shorter than in second pair, but preserving the same j^roportion as to length and 

 similarity as to setse; seventh joint with claw considerably less than half as long as sixth joint. Fourth 

 pair with the same enormous seta on third joint. Seventh pair (fig. 4e) is rather robust; .second joint 

 expanded, only about twice as long as broad; third joint scarcely distinguishable ^ fourth and fifth 

 joints much widened, with curved rows of very fine spines on the outer side and on the convex 

 margin; sixth joint is not much longer than the fifth, with some five minute incisions along the 

 longest margin and at the end with a long seta and two strong, moderately long spines pectinate 

 along the concave margin; seventh joint very short and the claw minute. Sixth pair of legs are a 

 little, and fifth pair somewhat, more slender than seventh pair, with seventh joint conspicuously longer 

 and thinner, while fourth and fifth joints are adorned in the main as in seventh pair. 



Abdomen somewhat shorter than the two preceding segments combined. — Uropods short, 

 both rami one-jointed and the endopod somewhat longer than the exopod. 



Length 2""". 



Remarks. C. trispinosus in closely allied to T. tenuicornis G. O. S. Both these .species agree 



