326 DISCOVERY REPORTS 



The basipodite of the maxilliped is separated from its lamella by a suture. The second 

 joint of the palp is broad, with its margin fringed with setae, some of which have their 

 distal ends flattened and toothed ; the third joint is almost parallel-sided with its truncate 

 distal extremity fringed with setae. The ventral surface of the palp and of the basipodite 

 is sparsely covered with delicate setae. The modified spines on the inner margin of the 

 propodus of the second thoracic appendage are similar to those on the corresponding 

 joint of S. trilobitoides, and are very like those figured for S. platygaster, n.sp. (Fig. 196). 

 The propodus of the third thoracic appendage of the adult male bears a double row of 

 seven modified spines at the proximal end of its inner margin and a further five extend 

 in a median position towards the distal end of joint. These spines are short and stout, 

 with a delicate distal extremity and with the distal half, facing towards the distal end of 

 the propodus, covered with short dense hairs. Similar setae are found on the inner 

 margin of the carpus, and a single one at the inner distal angle of the merus. The re- 

 maining appendages bear setae which are either simple or pectinate ; the latter, which 

 are more abundant on the joints of the last appendage, are found towards their distal 

 ends. The last pair of thoracic appendages is much smaller than the rest : in that of the 

 mature male the propodus is broader than the corresponding joint in the female, and 

 its outer margin is armed with a number of strong spines ; the dactylus in the male is also 

 slightly recurved. 



The protopodite of the first three pairs of pleopods has a produced angle which bears 

 long plumose setae, three on that of the first and two on each of the second and third. 

 The sutures of the exopod of both fourth and fifth pleopods are oblique and placed 

 rather near their distal ends: the endopods of both are large and undivided. The proto- 

 podite of the uropod has its inner angle produced into a sharp spine. The endopod is 

 a little longer than the exopod; both are elongate-oval in shape with pointed distal 

 extremities. The apices of both exopod and endopod and the outer margin of the former 

 are deeply serrated. 



Distribution. Studer's specimens were collected from the Crozet Islands and a 

 locaHty west of Kerguelen Island ; those in the present collection come from the South 

 Orkneys and South Sandwich Islands. 



20. Serolis trilobitoides, Eights (Fig. 13 rt; Plate XIV, fig. 7). 



S. trilobitoides, Eights, 1833, pp. 53-7, 2 plates. 



5'. cornuta, Beddard, 18846, pp. 49-53, pi. i, figs. 1-6. 



S. trilobitoides, Eights, Hodgson, 1910, pp. 23-30, pi. iv, figs. 1-8; Monod, 1926, p. 38; Nordenstam, 



1933. PP- 59-60, text-fig. 5 a. 

 S. zoiphila, Stechow, 1921, pp. 221-3; Nierstrasz, 1931, pp. 222-4. 



Occurrence. St. 170: Clarence Island, 324 m.; i ? (non-b), i immature specimen. 

 St. 172: South Shetlands, 525 m.; i <? and 3 immature specimens. 



Diagnostic characters. Body (Plate XIV, fig. 7) broadly ovate. The largest male in 

 the collection is 52 mm. in length without the terminal spine of 2 mm., and 48 mm. in 

 greatest breadth; the female is 51-5 mm. in length (including the terminal spine) and 



