40 DISCOVERY REPORTS 



Hab. Palmer Archipelago, Graham Land; South Orkneys; Enderby Land; Mac- 

 Robertson Land; Queen Mary Land; South Victoria Land. 



Fig. 24. Trematomus eulepidotns. x |. 



The types of this species, 140 and 165 mm. in total length, are from the entrance to 

 McMurdo Sound, 300 metres, and from near Inaccessible Island, 416 to 452 metres. 

 Trematomus eulepidotns is closely related to T. lepidorhinus, but differs in the shorter 

 snout, broader interorbital region, more oblique mouth, shorter tail, more numerous 

 dorsal rays, and much shorter lower lateral line. 



Genus DISSOSTICHUS 



Dissostichus, Smitt, 1898, Bih. Sv. Vet.-Akad. Handl., xxiv, iv, No. 5, P- 3; Regan, 1913, 

 Trans. R. Soc. Edinburgh, xlix, p. 279; Norman, 1937, Discovery Rep., xvi, p. 91. Type 

 Dissostichus eleginoides, Smitt. 

 Differs from Trematomus in the longer snout and strongly projecting lower jaw; teeth 

 in the upper jaw biserial, those of the outer row enlarged, spaced, canine-like; a group 

 of stronger teeth on each praemaxillary ; teeth of lower jaw uniserial, spaced, canine-like. 

 Two species ; one from the Patagonian region, one from the Antarctic Zone. 

 Coasts of the Antarctic Continent and northwards to the Patagonian region and the 

 coast of Argentina. 



Dissostichus mawsoni, Norman. 



Dissostichus eleginoides {nan Smitt), Vaillant, 1906, Bull. Mus. Paris, 1906, No. 3, p. 139; 1906, 



Exped. Antarct. Franf. (1903-1905), Poiss., p. 36. 

 Dissostichus mawsoni, Norman, 1937, Rep. B.A.N.Z. Antarct. Res. Exped, Ser. B, i, p. 71, fig. 6. 



Depth of body 5* to nearly 6 in the length, length of head about 3. Snout ij to 

 if times as long as eye, diameter of which is 4 to 5i in length of head ; interorbital width 

 4I to 5. Maxillary extending to below middle of eye or a little beyond; upper surface 

 of head to below middle or anterior edges of eyes, cheeks and opercles scaly ; no elongate 

 naked areas on upper surface of head; 12 or 13 gill-rakers on lower part of anterior 

 arch. 135 to 150 scales in a longitudinal series from above base of pectoral to caudal; 

 90 to 96 in upper lateral line, which ends below posterior rays of dorsal; 35 to 38 in 

 lower lateral line, which does not extend forward as far as level of middle of anal fin. 

 Dorsal VIII-IX, 25-27. Anal 25-26. Pectoral with 27 to 29 rays, nearly | length of 

 head, much longer than pelvics, which do not nearly reach vent. Caudal truncate or a 

 little rounded; caudal peduncle longer than deep. More or less uniformly brownish, 



