SUPPLEMENT 197 



The protopodite of each of the first three pairs of pleopods is triangular in shape, and Uke those of 

 S. acuminata bear plumose setae (Text-fig. 26 a); the exopodite of the fourth pleopod is divided, near 

 its distal end, by a transverse suture at right angles to its long axis: the uropods (Text-fig. 28^) extend 

 half way along the lateral margins of the terminal segment; the protopodite of each is triangular in 

 shape; the exopodite is half the length of the endopodite, and both have rounded distal extremities, 

 that of the former bears two or three short plumose setae, and a few simple ones. 



a be 



Text-fig. 29. Serolis ovata sp.n. {a) Maxilla, x 32. {b) Maxillula, x 32. (c) Maxilliped, x 32. 



This species can be placed in the key to the species of Serolis (Sheppard, 1933, pp. 279-82), in 

 section BlClb (pleural plates on third abdominal segment extend beyond those of second) and in this 

 group in 2y? (ii) (Uropods not broad and extending beyond the posterior extremity of the terminal 

 segment). Thus, in general characters S. ovata sp.n. comes nearest to S. exigua Nordenstam (1933, 

 pp. 70-5), but can be readily distinguished from that species by the compact form of its body with its 

 somewhat thickened coxal plates, and by the absence of a median backwardly projecting spine to the 

 cephalosome. 



Distribution. Scotia Sea, 6i° 20-8' S., 54-04° 2' W. 



SUMMARY 



1 . The supplement records additional species of the family Serolidae from the Discovery collections 

 made between 1928-37. 



2. Two new species Serolis acuminata and Serolis ovata are described. 



REFERENCES 



Hale, H. M., 1952. B.A.N.Z.A.R. Expedition. Reports, series B, vol. vi, pt. 2, pp. 32-5, text-fig. 4. 



MoNOD, Th., 1925. hopodes et Amphipodes de I'Exped. Antarct. Beige, 2° note prelim. Bull. Mus. Paris, no. 4, pp. 296-9. 



1926. Tanaidaces, hopodes et Amphipodes. Resultats du voyage de la 'Belgica' en 1897-9, PP- 35-8. text-figs. 33-7. 



Nordenstam, A., 1933. Marine Isopoda of the families Serolidae, Idotheidae, Pseudidotheidae, Arcturidae, Paraseillidae and 



Stenetriidae mainly from the South Atlantic. Further Zoological Results of the Swedish Antarctic Expedition, 1901-3, 



vol. Ill, no. I. 

 Richardson, H., 1906. hopodes: Expidition Antarctique Frangaise {igo3-igo5) commandee par Dr Jean Charcot, pp. 7-10, 



pi. i, fig. I, text-figs. 12, 13. 

 Sheppard, E. M., 1933. hopod Crustacea. Pt. i. The Family Serolidae. Discovery Reports, vol. vii, pp. 253-362. 



