352 DISCOVERY REPORTS 



on the remaining appendages are stout and simple. The entire surfaces of the appendages 

 are covered with minute rounded imbricating scales. 



The first three pairs of pleopods are of the type in which the protopodite is triangular, 

 with its produced angle bearing plumose setae— three in the first pair, and two in each 

 of the other two. The suture of the exopod and of the endopod of the fourth pleopod is 

 almost transverse; the outer margin of the former is fringed with plumose setae. The 

 inner distal angle of the protopodite of the uropod is produced and bears strong plumose 

 setae at its tip. The exopod is a little more than half the length of the endopod ; both are 

 small and fringed with delicate hairs amongst which, at the distal and outer margins, are 

 strong plumose setae. 



Distribution. Richardson's specimens were collected at Booth- Wandel Island and 

 the Bay of Flanders ; those in the present collection come from the Palmer Archipelago 

 and the South Shetland Islands. 



32. Serolis aspera, n.sp. (Figs. 21, 22). 



Occurrence. St. 39: South Georgia, 179-235 m.; i immature specimen. 

 St. 123: South Georgia, 230-250 m.; i immature specimen. 

 St. 148: South Georgia, 132-148 m.; 3 immature specimens. 

 St. 160: Shag Rocks, 177 m.; i adult S, i ? (b.). 



Description. The length of the aduh male and female is the same (26 mm.), but the 

 former is slightly broader than the latter and measures 21 mm. in greatest width as com- 

 pared with 20 mm. The body (Fig. 21) is 

 broadly ovate in shape, with its dorsal sur- 

 face covered with shallow pits. The colour of 

 spirit specimens is variegated, being partly 

 grey and partly cream: in the adult male, 

 for example, the lateral parts of the cephalo- 

 some, the dorsal median spines, the tips and 

 edges of the coxal plates and the posterior 

 part of the terminal segment are all of the 

 lighter colour. 



The head is nearly twice as broad as long, 

 broadest anteriorly. The anterior margin 

 shows two shallow excavations, one on 

 either side of the well-developed rostrum ; 

 behind the latter is a well-marked transverse 

 ridge which extends across the width of the 

 head. Just in front of and between the eyes 

 is another transverse ridge, the lateral parts 

 of which are higher than the middle. The 

 portionofthehead between theeyesisraised F'g- ^i- Serolis aspera, n.sp., <?: x 4. 



into two rounded prominences, the surfaces of which are covered with rounded pits ; 

 between these two, posteriorly, is a third small raised area, the centre of which is marked 



