174 Transactions. — Zoology. 



Front of carapace with the median prolongation and the 

 lateral angles subequally produced ; back with a few scattered 

 tufts of hairs. 



Ocular peduncles slender, about three-fourths as wide as 

 the carapace in front ; basal scale produced on the inner side 

 into a short lobe, ending in several small spines. 



Antennules with peduncle reaching to or slightly exceed- 

 ing the ocular peduncles. 



Antennae with peduncle subequal to the ocular peduncles ; 

 basal joint produced on its hairy outer side to about the 

 middle of the penultimate joint, obtusely toothed at its apex, 

 and bearing at its antero-internal angle a short acute spine ; 

 acicle slightly shorter than ocular peduncles, somewhat curved 

 outwards, and with about five tufts of hair on the inner edge ; 

 flagellum reaching to end of right chelipede. 



The right chelipede has the meros nearly smooth, but 

 with a small fringe of hairs on its upper distal margin ; carpos 

 somewhat rounded above, broadening distally, with numerous 

 conical tubercles (in small specimens only granules) more or 

 less arranged into five longitudinal rows, and mixed — especially 

 towards the outside — with a few tufts of short hairs. Seen 

 from the side the meros is nearly quadrangular, while the 

 carpos is deeply triangular, the upper face forming the base ; 

 its. outer side is smooth, and the distal extremity is margined 

 by a row of rounded tubercles. On the inner side the carpos 

 is produced into a pyramidal tubercle. The propodos is about 

 equal in width to the carpos, is ovate in form, nearly quite 

 glabrous, and is covered with rounded tubercles, forming with 

 the margins six longitudinal rows ; of these, the 2nd from the 

 upper margin is continued into a strong ridge-like row of 

 tubercles on the dactylos, the 3rd and 4th unite to form a 

 single ridge on the immobile finger, the 5th is very short ; the 

 fingers are strongly toothed on the inner side. 



The left chehpede is much smaller than the right, and is 

 somewhat slender ; the carpos bears a single row of spines on 

 its upper edge, with numerous tufts of hairs ; the propodos, 

 which is scarcely larger than the dactylos of the right cheli- 

 pede, has about two rows of rounded tubercles on its upper 

 edge, and a few tufts of hairs on its inner edges. 



The ambulatory legs are long, furnished with numerous 

 tufts of coarse hairs, especially on the margins and towards 

 the extremities. In the posterior pair the hairs on the 

 dactyli tend to assume the appearance of a thick fringe on 

 either margin. 



The colour of large specimens is dark-grey, greyish-green, 

 or brown, often relieved with blue at the base of the joints of 

 'the six anterior legs, the tips of the antennae, and the granules 

 ■on the chelipedes. 



