354 DISCOVERY REPORTS 



to these ridges, and nearer the median keel, are two small round prominences, one on 

 either side. 



The antennule has a four-jointed peduncle: the first joint is broad, geniculated, 

 covered with fine hairs ; the second is about the same length as the first, broader distally 

 and covered with dense hairs ; the third is nearly one and a half times as long as the second, 

 but narrower, and three times as long as the fourth. The flagellum comprises twenty- 

 five joints in the female, and thirty-seven in the male. The first joint is about equal in 

 length to the fourth peduncular joint; the second to ninth are each about half the length 

 of the first, then gradually increasing in length ; the terminal and penultimate joints are 

 narrow, the former bearing two delicate terminal setae. A single sensory seta is found 

 at the distal end of all except the first four joints. The antenna has a five-jointed peduncle. 

 The first joint is short and fringed with delicate setae ; the second is a little more than twice 

 as long as the first with longer setae on the inner margin ; the third is about equal to the 

 second, broader at the distal end, with a row of five groups of setae on the dorsal surface 

 a little within the margin and a second row of four groups arranged somewhat obhquely. 

 The fourth joint is about twice as long as the third, with six transverse rows each of four 

 groups of setae equidistantly placed, but with the distal row near the distal end of the 

 joint. The surface is covered with short hairs, amongst which longer ones are scattered. 

 The fifth joint is more than twice as long as the third, with five short transverse rows 

 each of four groups of setae. These are near the anterior margin, and arranged more or 

 less equidistantly, the distal row being near the distal end of the joint. The flagellum of 

 the adults of both sexes is incomplete, but in an immature specimen is composed of 

 sixteen joints, of which the terminal and penultimate ones are small. 



The mandibles are of the usual type, the form of the right is shown in Fig. 22 a. The 

 outer lobe of the maxillula bears ten stout spines and one delicate seta on the inner angle 

 of its distal truncate extremity ; the inner lobe is about two-thirds the length of the outer, 

 fairly stout, with its oval distal end bearing two minute setae. The maxilla has its two 

 outer lobes each bearing two long setae with a few delicate pectinations along their 

 inner edges ; the distal end of the fixed lobe is truncate and bears about ten stout and 

 eight more delicate setae. 



The maxilliped is broad, with the basipodite separated from its lamella by a suture; 

 the inner margin of the basipodite is covered with fine dense hairs amongst which are 

 scattered a number of long setae ; the second joint of the palp is not much broader at its 

 distal than at its proximal end, and its under surface is covered with scattered setae. 

 The terminal joint is almost parallel-sided, with the rounded distal end fringed with 

 setae. 



The second, third, fourth and last thoracic appendages of the adult male are shown in 

 Figs. 22 b-e. The propodus of the second is greatly expanded, with its inner margin 

 armed with a row of about thirty-nine broad processes alternating with peculiar 

 modified spines (Fig. 22 b). The distal end of the carpus is crenulate, and bears two stout 

 spines surrounded by numerous setae. The third thoracic appendage of the male is 

 much smaller than the second, with the propodus expanded and its inner margin armed 



