FISHES—REGAN. 25 
For the first time our knowledge of the fishes of the coasts of the Antarctic 
continent is sufficiently advanced to make it worth while to attempt to delimit an 
antarctic zone, and to divide it into districts. 
For the purposes of reference it may be stated at once that the conclusions I have 
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Fic. 2.—Map showing the mean annual surface isotherms of 6° C, — ——— — and 12° C. 
_—-— -—.- , as calculated by Dr. Schott, respectively approximating to the northern boundaries 
» of the Antarctic and Subantarctic Zones; the extreme limit of pack-ice ~ ~ ~ bounding the 
Glacial District (G); and the Kerguelen (K), Magellan (M) and Antipodes (A) Districts. 
reached are that south of the tropical zone the distribution of coast fishes is best 
illustrated by the following classification :— 
1. South Temperate Zone, with seven districts: Chile, Argentina, Tristan 
da Cunha, Cape, St. Paul, Australia, and New Zealand. 
E 
