DESCRIPTION OF SPECIES 301 



uropods extend almost to the tip of the segment ; both the endopod and exopod are 

 elongate oval in shape and fringed with long plumose setae, the latter a little shorter 

 than the former. 



Remarks. The mouth-parts of this species are quite typical. The maxilliped has the 

 basipodite separated by a suture from its lamella. Previous workers have failed to notice 

 the presence of a very minute extra joint to the palp of this appendage ; it lies in a slight 

 groove on the outer side of the third joint, and does not extend as far as its tip, and it 

 carries on its truncate extremity a group of three or four long setae. A similar joint is 

 found in a corresponding position on the maxillipeds of S. kempt, n.sp., as well as in 

 some less closely allied species ; in S. septemcarinata, Miers, its position is indicated by 

 a notch at the distal extremity of the third joint which separates off, on the outer side of 

 the joint, a group of three or four long setae. 



The types of spines present on the propodus of the second thoracic appendage are 

 very similar to those figured by S. beddardi, Caiman (see Fig. 3 b). Those on the pro- 

 podus of the third thoracic appendage of the male are unlike the typical variety. Each 

 consists of a broad proximal portion, the central axis of which extends as an elongated 

 slender projection surrounded at its base by a dense mass of short hairs ; the central area 

 between the rows of spines is toothed, and as Tattersall (1921, p. 228) pointed out, the 

 inner margins of the merus and carpus of this limb are densely clothed with long 

 plumose setae. The propodus of the last thoracic appendage in the male is much broader 

 than is usual and bears a series of stout spines each of which carries a double row of short 

 pectinations towards its distal extremity; the merus and carpus are also broader in 

 proportion to their lengths than are the corresponding joints of the other limbs. 



Distribution. Pfeffer's and Tattersall's specimens came from South Georgia, as did 

 the present ones ; Richardson has recorded it from Booth- Wandal Island and from the 

 South Sandwich group. 



II. Serolis elliptica, n.sp. (Figs. 7, 8). 



Occurrence. St. 56: East Falkland Island, io|-i6 m.; i immature specimen. 

 St. WS 243: 52° 00' S, 62° 40' W, 253-248 m.; 3 9? (b.). 



Description. The largest specimen (Fig. 7) measures 6 mm. in length and 4 mm. 

 in greatest breadth. The body, together with the broad almost terminal uropods, is oval 

 in shape, with a convex rounded dorsal surface covered with microscopic rounded scales, 

 arranged in alternating rows and overlapping like tiles on a roof. The head is consider- 

 ably broader than long, equally broad at the anterior margin and at the level of the eyes, 

 but narrower between these two regions. There is no rostrum, but a slight concavity 

 exists on either side of the middle line for the reception of the base of the antennules, 

 behind which is a low transverse ridge which extends across the head and on to the 

 lateral portions of the cephalosome. The eyes, which are small, oval in shape, and contain 

 black pigment, are situated far apart, on slightly raised areas in the postero-lateral 

 angles of the head. 



The second thoracic somite is fused with the head, but this fusion may not be quite 



