394 EIGHTH PACIFIC SCIENCE CONGRESS 



2. Indian Province. (Coast of India and Burma, Timor Sea) 

 B. Western Pacific Subregion. 



3. Malayan Province. (Malay Archipelago, South China Sea, 

 Philippine Islands) 



4. Chinese Province. (East China Sea, Yellow Sea, Southern 

 Japan) 



5. Papuan Province. (Southern New Guinea, tropical Austra- 

 lia, Coral Sea) 



C. Central and Eastern Pacific Subregion. 



6. Hawaiian Province. (Hawaii) 



7. Polynesian Province. (Polynesia) 



8. Mexican Province. (Southern California, Mexico, Panama, 

 Peru) 



Constitution and Interrelationship of Bryozoa Fauna 

 OF Each Subdivision 



Table I is a sum total of the known genera and species of subdivi- 

 sions of the Indo-Pacific Region, revised and enlarged by our recent 

 investigations. The upper line of each area indicates the total number 

 of genera (in Gothic type) and species (in ordinary Roman type), and 

 the lower line the number of genera and species that have not been 

 found elsewhere. The number of species known only from one prov- 

 ince seems to be rather great, but from the present condition of our 

 knowledge, it is not easy to say which of them are really endemic. 



Relation between Ethiopian and Indian Provinces: As shown in 

 Table II the number of common species of these provinces is smaller 

 than that of uncommon ones. The Bryozoa of the Ethiopian Province 

 is rather closely related to that of the Atlantic, and, on the other hand, 

 the bryozoan fauna of the Indian Province somewhat resembles that of 

 the Malayan Province. 



Relation between Malayan and Chinese Provijices: The number of 

 genera and species in common between the two provinces is consider- 

 ably great, as is clearly seen in Table III, and the boundary line can 

 not be drawn anywhere. But it seems to be adequate to separate the 

 Chinese Province from the Malayan Province, for the specific differences 

 in the same genus are rather great. 



The Pacific coast of middle Japan seems to be the meeting-place of 

 northern and southern types. Arctic forms descend to it and in most 

 cases go no further south; the tropical forms make their way up to it, 

 and generally have not become naturalized in the colder waters beyond it. 



Relation between Malayan and Papuan Provinces: Table IV in- 

 dicates the common and uncommon species between these two provinces. 



