324 DISCOVERY REPORTS 



difference exists between them ; the colour of S. cormita is pale grey with dark brown 

 spots of pigment (for distribution see Plate XIV, fig. 6), whilst that of S. trilobitoides is 

 pale horn colour, blotched and with a darker colour which varies from maroon to pale 

 terra-cotta. The colour given by Studer for S. cormda is pale with a darker posterior 

 edge to each segment. 



(6) With regard to the distribution of the two species, both have been recorded from 

 Kerguelen, S. cormita from the west of the island, and S. trilobitoides from Betsy Cove. 

 Studer's material of S. cormita came from this locality and also from the Crozet Islands, 

 whilst that of the present collection comes from the South Orkneys and South Sandwich 

 Islands. The specimens of S. trilobitoides in the present collection come from Clarence 

 Island and the South Shetlands, and the species has previously been recorded from the 

 latter locaHty. Hodgson's material came from a station in 67° 21' 46" S, 155° 21' 10" E, 

 which is much farther east than any other recorded for either species. 



19. Serolis cornuta, Studer (Figs, i a, c, 13 ^, f, Plate XIV, fig. 6). 



S. cormita, Studer, 1879, pp. 21-24, P'- '"> ^8^. 1-7; 1884, p. 7. 

 Brongniartia cornuta, Studer, 1876, p. 75. 

 Occurrence. St. 164: South Orkneys, 24-36 m.; 2 ?? (b.), 6 $$ (non-b.), 2 adult cjc?, 4 immature (JcJ, and 

 a number of small specimens. 

 St. 363: South Sandwich Islands, 329-278 m.; 2$? (non-b.), i young cj. 



Diagnostic characters. The body of the adult male (Plate XIV, fig. 6), excluding 

 the spine on the terminal segment, is circular in outline, that of the female is not quite 

 as broad; the largest male in the collection measures 49 mm. in length, excluding the 

 terminal spine of 4 mm., and 49 mm. in breadth, whilst the female is 51-5 mm. long, 

 without the terminal spine, and 49 mm. in greatest breadth. The colour of the living 

 animal is pale grey with dark brown spots of pigment. 



The head is shield-shaped, broadest anteriorly, with the anterior margin excavated 

 on either side of the small median rostrum for the reception of the antennules ; im- 

 mediately behind this is a transverse ridge extending to the sides of the head. In front 

 of and between the eyes, is a squarish raised area with its posterior margin slightly 

 concave, the two ends being somewhat produced backwards; the posterior margin is 

 separated from the remaining portion of the head by a deep groove. The area between 

 the eyes is raised, and separated by grooves from the elongated protuberances on the 

 outer sides of which the eyes are situated. The area between the eyes is divided into three 

 parts, of which the central is less convex and has its posterior margin produced into a 

 small, median, somewhat rhombic-shaped area which bears a small rounded pigment 

 spot ; each of the lateral parts is convex, oval in shape and produced posteriorly into a 

 small spine. 



The eyes are long, reniform in shape, rather narrow, and containing black pigment. 

 The lateral portion of the cephalosome is divided into an anterior and a posterior part 

 by a well-marked transverse groove, which extends outwards to the lateral margin from 

 a point near the postero-lateral angle of the eye. 



The thoracic somites are all sub-equal, with well-developed coxal plates, those of the 



