14 THE VOYAGE OF H.M.S. CHALLENGER. 



2. Cape of Good Hope. 

 The few fishes collected at the Cape do not oflfer any particular interest. 



(a.) Marine Species. 

 ChorisocMsmus dentex, Pall., Simon's Bay. 



Tetrodon honckeni, BL, Cape of Good Hope (the poison-fish of Simon's Bay). 

 Bdellostoma cirrhatum, Forst., Simon's Bay. 



(b.) Fresh-water Species. 

 Spirobranchus capensis, C.V., Eivers at Wellington and Cape Town. 

 Barhus ctfer, Ptrs., Eivers at Wellington and Cape Town. 

 Barhus, sp. {'i), in bad state; River at Cape Town. 



II. THE FISH-FAUNA OF THE ANTARCTIC OCEAN AND OF SHORES 



ABUTTING ON IT. 



The study of the Antarctic sm-face fish-fauna, and its comparison with that of the 

 Arctic Regions, is one of the most instructive portions of zoogeography. The abundance 

 of fish-life appears to decrease in the same proportion towards both Poles. The forms 

 peculiar to the Antarctic are analogous to those of the North ; thus the Cottoids of the 

 North are represented by the Notothenice, Chcenichthys, &c., of the South, the Salmonoids 

 by the HaplocliitonidcB ; yet there is no such relation between the representative forms as 

 might be considered to be genetic. The resemblance is rather an external one, indicated 

 by the general form of the body, structure and development of the fins, presence of an adi- 

 pose fin, &c. Beside those fishes which are peculiar to the Antarctic, some other forms well 

 developed in the North, but nearly or entirely disappearing between the Tropics, reappear, 

 as Sebastes, Agonus, Spinax, Myxine, difi"ering but little from their northern congeners. 



The Expedition obtained the fishes belonging to this fauna at two points. 



A. KEEGUELEN ISLAND AND PEINCE EDWAED'S ISLAND. 



Except a flat fish from Prince Edward's Island, the specimens were collected on the 

 north-eastern side of Kerguelen Island, between the 7th and 31st of January 1874. 

 Nearly all we know of the fishes of this island is due to the Naturalists of the Antarctic 

 Expedition under Captain Ross, and to those of the " Transit of Venus" and Challenger 

 Expeditions. The number of species known is very small, the following three only 

 having been described, besides those obtamed on the present Expedition : — 



