FISHES—REGAN. 33 
members of the family ; two genera are peculiar to the Antarctic, two common to the 
Antarctic and Magellan, four peculiar to the Magellan District, one common to 
Magellan and Argentina, and one peculiar to the last-named. 
The Magellan District is the headquarters of the southern Zoareidae, which may 
have reached it originally from the north along the American coast, perhaps migrating 
in rather deep and cold water. It is of interest to note that no Zoarcidae are known 
from the South Temperate and Subantarctic Zones outside the Argentine and Magellan 
Districts. Evidently the southern coast fishes of this family have been able to extend 
their range only along a nearly continuous shore line ; this is in harmony with what 
is known as to their breeding and development. 
THE ANTARCTIC ZONE. 
This includes the coasts of the Antarctic continent and the islands that lie to the 
south of the isotherm of 6° C., with the probable exception of Macquarie Island. 
It is characterised by the complete absence of South Temperate types, by the 
absence of Bovichthyidae and the great development of the other Nototheniiformes. 
It is more sharply marked off than any other zone, the percentage of peculiar genera 
being extremely high and that of species that range beyond its limits very low. 
GLACIAL Disrricr. 
This ineludes the coasts of the Antarctic continent and neighbouring islands, 
together with South Georgia, the South Sandwich Islands, and probably Bouvet Island, 
all lying within the extreme limit of pack-ice. About 90 per cent. of the coast fishes 
of this district are Nototheniformes and most of the rest are Zoarcidae. 
NororHentipagz. The Nototheniinae are represented by Trematomus (14 spp.), 
Pleuragramma (1 sp.), Notothenia (6 spp.), and Dissostichus (1 sp.).  Eleginops is 
absent. The two first-named genera are confined to this area; five of the six species 
of Notothenia are peculiar, the exception being .V. coriiceps, which ranges to Kerguelen. 
Dissostichus eleginoides is common to Graham Land and Magellan. 
The Harpagiferinae (Artedidraco, Dolloidraco, Histiodraco, Pogonophryne, Harpa- 
yifer) ave confined to this district, with the exception of Marpayifer bispinis, which 
extends also to the Kerguelen and Magellan Districts. 
BATHYDRACONIDAE are confined to the district. Lathydraco must be regarded 
as oceanic, and probably the related genera Gerlachea, Racovitzaia and Prionodraco 
should go with it ; but none of these has been found far from the coast of Antarctica, 
the most northerly being B. antarcticus, taken midway between Wilhelm Land and 
Heard Island. Parachaenichthys georgianus from South Georgia and Gymnodraco 
acuticeps from the coasts of the Antarctic continent may be reckoned as coast fishes. 
CHAENICHTHYIDAE are characteristic, the only extralimital forms being the two 
species of Chaenichthys (Kerguelen) and Champsocephalus esox (Magellan). 
