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



from the east coast of Africa to Australia, and extending to about lat. 36° S. This 

 province was not visited by H.M.S. Challenger, and requires to be explored. 



V. Australasian Province. — This division nearly corresponds to the Indian province 

 of Keferstein, 1 that is, including the seas of the Malay Archipelago, the China Sea, the 

 seas of the Philippines, of Celebes, of New Guinea, and of the north of Australia. 



VI. West Pacific Province. — This province includes the part of the Pacific Ocean 

 which is traversed by the equatorial currents — north equatorial drift current, equatorial 

 counter current, south equatorial drift current. It extends no further than from lat. 40° 

 N. to lat. 30° S., and rather corresponds with the Polynesian province of Keferstein. 2 



VII. East Australian Province. — This division occupies that part of the ocean 

 between Australia and New Zealand. 



VIII. North Pacific Province. — This division extends, south of the Behring Sea, 

 from one continent to the other, and comprises all that part of the North Pacific Ocean 

 which is traversed by the North Pacific drift current. It extends to the south as far as 

 the foregoing province, and towards the American coast its southern limit is near 

 lat. 30° S. This province is thus limited by the Aleutian and Californian regions of the 

 malacoloa;ists. 



Until the voyage of H.M.S. Challenger this province was scarcely explored at all, 

 and its exploration, therefore, gave remarkable results. All the four new species of 

 Gymnosomata were obtained in it. 



IX. South-East Pacific Province. — This province lies along the American continent, 

 and occupies all that part of the Southern Pacific Ocean which is traversed by Humboldt's 

 current, that is to say, from lat. 37° S. to the Bay of Panama. 



X. Antarctic Province. — This province surrounds the South Pole, and comprises the 

 region corresponding to the Arctic province, namely, nearly the whole part of the sea 

 included within the isothermal line of 50° F., for August, and traversed by the Cape 

 Horn current, the southern connecting current, the South Australian current, and the 

 Antarctic drift ; it is nearly the same as the Magellanic littoral region of the malaco- 

 logists. 



This province has been hitherto but little explored. As to the Pteropoda, its short 

 exploration by H.M.S. Challenger procured, with other well-known species, three species 

 of Thecosomata, which had never been observed since their first discovery, namely, 

 Limacina antarctica, Woodward (Station 153), Limacina (or Spinalis) australis, 

 Souleyet (Stations 146, 153), and a new species of Clio (or Cleodora) (Station 156), 

 which had probably been previously collected by the naturalists of the " Astrolabe " 

 during her last voyage to the South Pole, 3 but which was not described. 



1 Bronn, Die Klassen unci Ordnungen cles Thierreiehs, Bd. iii. p. 1135. 



2 Loc. cit., p. 1136. 



3 Souleyet, Histoire nalurelle cles Mollusques Pteropodes, p. 48. 



