OF THE HALOLIMNIC FAUNA OF LAKE TANGANYIKA. 347 



the great rivers which flows away to the Victoria Nyanza, so that it 

 is a matter of comparative ease for one of those organisms to be 

 transferred from one basin to the other. Therefore judging from the 

 fact that the fauna of Lake Tanganyika differs from that of other East 

 African lakes in alone possessing evidences of a marine origin, 

 I should be inclined to regard the jelly-fish as being an emigrant 

 from Tanganyika. 



In all other respects I think I am in essential agreement with 

 Mr. Hudleston's paper, and am intensely interested in the way in 

 which he has correlated the geological facts relating to the 

 Tanganyika problem. It seems, on the whole, that there is 

 probably less evidence of direct connection between the Tanganyika 

 gasteropods and Jurassic gasteropods than we formerly supposed ; 

 that being so it seems that the whole Tanganyika problem is 

 much where it was when I came back from my first expedition, 

 only it has grown bigger and is more difficult to understand. 



I am extremely interested in what Mr. Hudleston has said, and 

 congratulate him heartily on his paper. 



Dr. Blanford, F.R.S. — One matter I would point out is that I 

 was not the original discoverer of the Jurassic beds of Abyssinia. 

 They Avere discovered by the French explorers Ferret and Galinier. 



There is one other point I would refer to and that is the 

 extraordinary resemblance that seems to be more apparent every 

 day between the geological conditions of South Africa, including 

 Central Africa, and the Indian Peninsula. There are similar 

 rocks — thick sandstones destitute of fossils, or only containing 

 plants and some fossils of fresh-water origin, and I suggest 

 that these great Indian and African formations, chiefly sandstone 

 and apparently of fresh-water origin, are great river deposits like 

 those of the Ganges plain. 



Dr. Henry Woodward, F.E.S. — I am no authority on the 

 subject of the paper, for my acquaintance with the subject is 

 purely as a reader of Mr. Moore's book and I have not visited 

 Africa. 



With regard to the mollusca I was led, as Mr. Moore was, and 

 many others, to be struck by the extraordinary resemblance 

 between the Jurassic shells, which are now placed on the table 

 behind Mr. Moore's specimens for your consideration, and the 

 specimens which Mr. Moore brought from Lake Tanganyika. My 



