208 Proceedings of the Pi^oyal Pliysieal Society. 



Scandinavian Peninsula, Denmark, Holland, Iceland, and tlie 

 northern half of the British Isles. 



2. The New England Begion. — The northern boundary of 

 this region I am unable to fix, probably it extends up to the 

 coast of Labrador; southwards it extends about as far as 

 Cape Hatteras. 



3. The West Indian Region extends southwards from the 

 last, about as far as the mouth of the Eio de la Plata, and 

 includes the Gulf of Mexico and the shores of the islands at 

 its mouth. 



4. The Lusitcmian Region includes the southern half of 

 the British Isles, the coasts of France, Spain, and Africa, 

 about as far as the Canary Islands. It is, of course, closely 

 related to the Mediterranean Eegion, but that sea contains 

 so many forms peculiar to it that it appeared best to regard 

 it provisionally as a distinct region. 



5. The Mediterranean Region consists of the Mediterranean 

 and Black Seas. Strictly speaking, here also a subdivision 

 should be made, like that adopted in regard to the oceans, 

 separating the pelagic from the littoral forms ; but the dis- 

 tinction does not seem to be so clearly marked, perhaps 

 owing to the subject not having been sufficiently investigated. 



6. The West African Region extends from the Canaries to 

 about the Tropic of Capricorn. 



7. The South African Region here occupies a considerably 

 greater area than is given to the corresponding one in Dr 

 Fischer's arrangement. It has been allowed to extend from 

 the Cape as far as the Eed Sea, and to include Madagascar 

 and Mauritius, as well as certain islands of the South Atlantic 

 and Southern Oceans, the Tristan and Prince Edward groups, 

 with the Kerguelen and Heard Islands. 



8. The Red Sea has been separated as a distinct region, 

 since it seems to contain several peculiar forms. 



9. The Indo-Malayan Region I regard as extending from 

 the Ked Sea eastward and northward somewhat further than 

 the Island of Formosa, and as including the Philippines, 

 Papua, and all the Malay Archipelago. Probably a portion 

 of the northern coast of Australia should be added, as is done 

 by Fischer, but of this I am not certain. 



