294 DISCOVERY REPORTS 



outer margin for about a third of its width : two plumose setae are present at its extremity. 

 The endopod of the fifth pleopod is about the same size as the exopod and is undivided. 



Distribution. The specimens in this collection come from the Palmer Archipelago, 

 a locality on the opposite side of the Antarctic Continent and not so far south as that 

 given by Tattersall for his type specimens. The latter were taken ofl^ Oates Land, 

 69° 43' S, 163° 24' E. 



Since the above was written, Nordenstam (1933, p. 65) has described a new form of 

 S. glacialis, a variety austrogeorgiensis. The description is based on a single young female 

 which appears to differ from the main species. Of the ten points of difference noted 

 between this variety and the typical form, only three seem to be of real diagnostic 

 value, namely: 



(i) The posterior angles of the coxal plates do not protrude freely. 



(2) The distinct proximal spine in the middle line on the pleotelson is missing, and 

 the lateral keels are not so marked as in the main species and do not terminate in spines. 



(3) The pleura of the third abdominal segment reach as far back as those of the second 

 abdominal segment. 



Of these three, number (2) is the only one to which any real importance can be attached. 



In the female of the typical form the spines are perhaps not so pronounced as in the 

 male, and the pleura of the second and third abdominal segments are much more nearly 

 the same length ; those of the third segment do not reach quite as far back as those of 

 the second. Since the differences between the species and its variety are so slight, I have 

 no hesitation in including the varietal name mistrogeorgiensis'mthe synonymy of S. glacial is. 



Nordenstam gives a figure of the maxiUiped of the variety (p. 68, text-fig. 16) and 

 states that he failed to find any suture between "the coxopodite and the proximal epipo- 

 dite ". I very much doubt the correctness of this statement since in typical S. glacialis, 

 and in fact in all the known species of Serolis, a suture is present in this position. 



8. Serolis septemcarinata, Miers. 



S. quadricarinata. White, 1847, p. 106. 



5. septemcarinata, Miers, 1875, p. 116; Miers, 1879, p. 206, pi. xi, fig. 3; Studer, 1884, p. 8; Beddard, 

 1884 b, p. 47, pi. ii, fig. 14, pi. viii, figs. 3-5 ; Pfeffer, 1887, p. 63, pi. ii, figs. 5, 6, pi. iii, figs. 1-26, 

 pi. iv, fig. 6; Collinge, 1918, p. 74, pis. iii, iv, figs. 1-13; TaUersall, 1921, pp. 227-8; Monod, 

 1931, p. 26; Nordenstam, 1933, pp. 61-3, text-figs. 



S. ovalis, Studer, 1879, p. 24, pi. iii, figs. 8-10. 



Occurrence. St. 32: South Georgia, 91-225 m.; 2 ?? (b.). 



St. 39: South Georgia, 179-235 m.; 2 ?§ (b.), 5 immature specimens. 



St. 45 : South Georgia, 238-270 m.; 5 ?? (b.), i <?• 



St. 456: Bouvet Island, 40-45 m.; 16 ?? (b.), 14 ,S<S, a number of immature. Cumberland 



Bay, from kelp root washed up on the beach. 2 ?$ (b.). 



St. MS 71: East Cumberland Bay, 110-60 m.; i ? (b.). 



Diagnostic characters. Beddard (p. 47) points out that in this species the males 

 differ from the females only in their greater size. In this collection the largest female is 

 13-5 mm. in length and 10-5 mm. in greatest breadth; it has a greater length than 

 Beddard's largest male specimen which measured 13 mm. in length and 11 mm. in 



