NOTOTHENIIFORMES 7 



Examination of this fine series of specimens shows that M. microps is very closely 

 related to M. tnormoratus, Giinther, from Kerguelen, and may even prove to be identical 

 with that species. Comparison of examples of equal size, however, suggests that M. 

 marmoratus has a smaller head, a slightly larger eye, and perhaps a shorter dorsal 

 filament. 



Fig. 2. Muraenolepis microps. x |. 



The only other species of Muraenolepis from the Antarctic Zone is M. microcephaliis, 

 Norman, known only from the unique holotype, 125 mm. in total length, from 63° 51' S., 

 54° 16' E (2000 metres of wire), collected by the B.A.N.Z. Antarctic Research Ex- 

 pedition. This form appears to be most nearly related to M. orangiensis, Vaillant, from 

 the Patagonian region. I have given a key to the four known species of Muraenolepis 

 elsewhere.^ 



REVISION OF THE ANTARCTIC NOTOTHENIIFORMES 



Regan's revision published in 1913,'^ together with his subsequent report on the rich 

 material collected by the 'Terra Nova',^ has placed the taxonomy of this group of 

 fishes on a sound basis. In more recent years, however, the Australasian Antarctic 

 Expedition of 1911-1914, and the British, Australian, New Zealand Antarctic Research 

 Expedition of 1929-193 1, together with the important collections of the Discovery 

 Committee, have brought to light a number of additional forms, and have added con- 

 siderably to our knowledge of the fish fauna of the Antarctic Zone.* The problems raised 

 by the study of this material have led me to undertake a new revision of these fishes, 

 which, although it amplifies that of Regan, only modifies his conclusions in certain 

 comparatively unimportant details. 



Division NOTOTHENIIFORMES 



Percoid fishes, normally without pungent fin-spines, with the spinous dorsal, when 

 developed, shorter than the long soft dorsal and anal, the principal caudal rays reduced 

 in number (usually 14), the pectorals typically broad-based, and the pelvics jugular, 



1 Norman, 1937. Rep. B.A.N.Z. Antarct. Res. Exped., Ser. B, I, p. 69. 



^ Trans. R. Soc. Edinburgh, XLix, pp. 249-289. 



^ 1914, Rep. Brit. Antarct. (' Terra Nova') Exped. 1910, Zool. I (i), pp. 1-54. 



* This Zone includes the Glacial District and the Kerguelen District, see Regan, 1914, t.c, pp. 33-36. 



