I. '21. 55 



The first pair of walking legs (second pereiopods) are slightly 

 shorter than the second pair. 



In the first right walking leg the merus is laterally com- 

 pressed, and bears rough scales on both upper and lower edges ; 

 these are fringed with long setae. The carpus bears similar 

 scales on the upper edge, and a single spine at the upper distal 

 extremity. There are scales on the upper and lower margins 

 of the propodite and these also bear short setae. There are 

 two short spines at the lower distal end of the joint. The 

 dactyl is slightly curved and is longer than the propodite. It 

 ends in a sharp transparent claw. On the lower edge there 

 are about fifteen slender transparent spines, increasing slightly 

 in size distally. On the upper edge there is an equally nu- 

 merous row of much smaller spines, and from the base of each 

 of these there springs a single long hair. In addition to this 

 there is a row of about ten or twelve spines on the inner sur- 

 face, nearer the upper than the lower edge. These also have 

 a few setae about their bases. Finally there is a row of btmches 

 of setae on the inner surface near the lower edge. 



The first left walking leg is generally similar to that just 

 described, but the spines composing the rows on the inner 

 surface of the dactyl and near the upper edge are not so 

 numerous. 



In the second right walking leg the teeth on the upper edge 

 of the dactyl are larger, and the spines on the lower edge are 

 rather more numerous, being about twenty in number. 



The second left walking leg is similar to the second right. 



The fourth pereiopods are of the usual form, small, com- 

 pressed, setiferous and imperfectly chelate. The imbricate 

 scaly area of the propodite is reduced to a single row^ of yellow 

 chitinous teeth. 



The fifth pereiopods are about as long as the fourth pair, 

 and end in minute chelae. There is a broad imbricate area on 

 the upper surface of the propodite. 



In the male there are three unpaired pleopods on the left 

 side of the abdomen ; in the female there are four unpaired 

 and on the first segment one pair of sexually modified pleopods. 



The uropods are of the usual form. 



The structure of the coxae of the fifth pereiopods in the 

 male is very peculiar and is characteristic of the genus. From 

 the right coxa there issues a long tube, w^hich is broad at its 

 base but rapidly narrows and ends in a long slender lash. 

 From the left coxa a process also protrudes, but it is quite short, 

 barely reaching the coxa of the opposite side, towards w^hich 

 it is directed. It is broad at the base and tapers rapidly to a 

 narrow point. The long lash of the right coxal process is 

 turned backwards tow^ards the abdomen. I have not seen 

 a female specimen 6f this species, and the following account 

 is taken from the description by Milne-Edwards and Bouvier 

 (1900):— 



" The paired sexual appendages of the female are sepa- 



