36 "TERRA NOVA" EXPEDITION. 



rightly included can hardly be questioned; of its L5 species of Nototheniiform 

 fishes nine arc known also from Graham Land, and the remaining six include 

 species of Tremutomitx and Arted'ulraco, whilst only one [t'liampxocejiliahix eponinri) 

 lias Magellan affinities. 



K.ERGUELEN I >ISTRICT. 



This includes the island of Kerguelen and also Heard Island, the Crozet Islands, 

 and Marion and Prince Edward Islands. 



The fish-fauna of Kerguelen is known from the collections made there by the 

 " Erebus and "Terror" and the "Challenger"; recently the "Gauss" collected 

 there, but obtained no additional species. 



There arc two species of the cosmopolitan genus Ruin : Muraeuolepix marmoratux 

 is related to }f. micropx and .1/. orum/ienxix of the Glacial District and of Magellan 

 respectively, and Zanclorhynchux xp'nufer is a genus and species peculiar to the island, 

 its nearest relative being the south temperate Conyiojmx (Ayriopux). 



The rest arc Nototheniifornies, viz., five species of Xototlienin, oi f llaipuyifer 



and two of Chaenichtliyx. Of these Xotothenia coriicepx and llarpayifer bixpinix are 

 found on the coast of the Antarctic continent ; the rest are peculiar, but show relation- 

 ship to species known from South Georgia and Graham Land, for X. xquamifronx is 

 closely related to X. lurxeni, X. acuta to X. t/ibberifronx, X. mizopx to X. nwlifronx, 

 and X. ryuneobrunc/in to X. coriicepx, whilst Chaenichthys, a genus peculiar to the 

 island, belongs to the Antarctic family Chaenichthyidae. Little is known of the other 

 islands that may pertain to this area, but it may be noted that at Marion Island 

 Sotothoun mariunensis is the representative of the South Georgian X. aiupixtifronx. 



At the first glance it may seem that as so many characteristic Antarctic genera 

 appear to be absent and most of the Nototheniidae belong to Xototlienin, which is well 

 represented in the Subantarctic Zone, the Kerguelen District might be included in the 

 latter. But a more critical examination shows that the texxellntu group, characteristic 

 ot Magellan, is absent, that the xquamifronx, acuta and inarionenxix groups are present 

 and are found elsewhere only in the Glacial District, and that the coriicepx group is 

 represented by A. coriicepx, an Antarctic species, and by the related X. cyaneobramhu. 



The only way to mark the dissimilarity of the fish-fauna of Kerguelen from that 

 ot Magellan or of the subantarctic islands of New Zealand, ami to express its attinit \ to 

 that of Antarctica, is to include il in the Antarctic Zone as a separate district, small 

 and impoverished, but with well-marked characters. 



THE SUBANTARCTIC ZONE. 



This includes the Fnlklands and the southern extremity of South America, 

 northwards about to Chiloe and Cape Blanco, and the extreme south of New Zealand, 

 w'li 'he adjacent islands, Stewart. Auckland. Campbell. Antipodes, and perhaps 

 Macquarie. Its limits correspond approximate!} to the isotherms of | •_' ( *. and (i ( '. 



