1056 



PRINCIPLES OF STRATIGRAPHY 



Molluscan Regions. 



A. Atlantic and Circumpolar regions. 



B. Indo-Pacific regions. 



C. Australian regions. 



1. Arctic sub-region 



2. Boreal " " 



3. Celtic " " 



4. Lusitanian sub-region 



5. West African " " 



6. South African " " 



[ I. Indo-Pacific sub-region. 

 2. Japanese sub-region 

 I. Australian sub-region 



D. American regions ■ 



V. Fishes. Giinther (20) recognized the following marine zoo- 

 logical regions based on the distribution of shore-haunting fishes: 



I. Arctic ocean. 2. Northern temperate zone divided into: (a) the temperate 

 North Atlantic and (b) the temperate North Pacific with further subdivisions 

 of each. 3. Equatorial zone, divided into: (a) Tropical Atlantic, (b) Tropical 

 Indo-Pacific, and (c) Pacific coast of tropical America with further subdivisions. 

 4. Southern temperate zone with several subdivisions, and 5. A ntarctic oceayi. 



VI. Marine M annuals. The following marine geographic 

 regions based on the distribution of seals, sea-cows, and cetaceans 

 have been recognized by Sclater (43) : 



1. Arctatlaiitica (seals of the sub-family Phocinae). 



2. Mesatlantica (monk seal and manatis). 



3. Philopelagica (Indian ocean, etc.), characterized by the presence of 

 dugongs and absence of seals. 



4. Arctirenia (North Pacific) with Phoca, and sea-bears and sea-lions, for- 

 merly the northern sea-cows (Rhytina) now also the gray whale (Rhachianectes). 



5. Mesirenia (Mid-Pacific) without sea-cows, but with the elephant-seal 

 (Macrorhinus). 



6. Notopelagica (Southern ocean) with four peculiar genera of seals, numerous 

 sea-bears and sea-lions, and two peculiar whales, the pigmy whale and Arnoux's 

 beaked whale. 



