178 



The pleon of the male slightly tapers from the third seg- 

 ment, the second segment is very short, the last four sub- 

 equal in length. The pleon of the female is fringed with 

 hairs. 



The orbits are circular, completely filled by the ocular 

 peduncles. The eyes are well pigmented. 



The fossettes are subcircular, large, and occupy almost 

 all the interocular space, there being a very thin septum be- 

 tween each. 



The antennae are very small. 



The epistome is narrow, transverse, and a little sunken. 



The buccal frame is transversely broad ; its upper mar- 

 gin shows four shallow arches with a small median V-shaped 

 point. 



The external maxillipeds are slightly pubescent, and 

 are without sutural line in distinguishing the ischium from 

 tlie merus ; they completely close the buccal cavity. The palp 

 consists only of the carpus and propodus, there being no dac- 

 tylus ; the propodus is hatchet-shaped, and the carpus has 

 on the inner side a tuft of hair at the distal end, which reaches 

 nearly to the end of the propodus. The exopod is compress- 

 ed and hidden. 



The chelipeds are well developed in both sexes, longer 

 than the legs, unarmed, smooth ; the merus is trigonous, the 

 carpus is rounded above with a tuft of short hairs at the 

 innejr angle, the palm is scarcely compressed, vertically narrow 

 at the proximal end, the upper margin ascending to the base 

 of the mobile finger, it is hairy on the lower border. The fin- 

 gers are nearly as long as the palm, not gaping, curved, or 

 hooked at the tips, especially the mobile one, minutely toothed 

 on the inner margin, with one or two larger teeth. 



The ambulatory legs are scarcely compressed, unarmed, 

 and not different notably in length ; the carpi and propodi 

 of the second and third pairs v/ith a fringe of hairs on the 

 lower margins, and the propodi with a fringe near the upper 

 margins, continued on the posterior surfaces of the carpi in 

 an oblique line, the first and last pairs are less hairy. The 

 dactyli are rather short, strong, curved, with sharp, slender 

 claws, and more or less hairy on their inner margins. 



Specimens found inside holothurians and ascidians; those 

 from ascidians are smaller, but without specific difference. 

 This crab is able to swim, and probably does not spend all 

 its time within the host. 



Length of carapace, 10 mm. 

 ,, of cheliped, 11 mm. 



Dredged by Dr. Verco, 12 fathoms, St. Vincent Gulf. 

 Ascidian specimens from 5 fathoms. 



