SUPPLEMENT TO THE 



GEOLOGICAL MAGAZINE 



FOE JULY, 1904 



ON THE ORIGIN OF TRE MARINE {HALOLIMNIC) 

 FA UNA OF I ARE TANGANYIKA. 



By W. H. HuDLESTON, M.A., F.E.S. 



(Vice-President, Victoria Institute.) 



[With Ttuo Plates.'] 



A Paper read before a Meeting of tlie Members and Associates o£ tlie Victoria 

 Institut<^, on May 25th, 1904, and published in this Magazine, by kind 

 permission of the Council, in advance of the annual volume of their 

 Transactions for 1904. 



CONTENTS. 



Part I.— General Considerations : Zoology and Palaeontology. 



Introductory. 



History of the subject and statement of Mr. Moore's views. 



The argument limited to the halolimnic gasteropods — Appendix on the 



Conchology. 

 Distribution of Jurassic faunas in intermediate areas — African Jurassics. 

 Character of freshwater faunas. 



On the possible ti'ansference from marine to freshwater conditions. 

 Jurassic fossils of the Mediterranean basin. 



Part II. — Outlines of African Geology. 



The three principal geographical divisions. 



The Plateaa-range of East Africa (the Great Central Range of 



Mr. Moore). 

 Geology of British East Africa. 

 Geological structure of the Congo basin. 

 The periphery of the Congo basin. 



Suggested correlation of the beds composing the interior of the basin. 

 Structure of a Graben. 

 Geology of Jjake Tanganyika. 



Part III. — Conclusions. 



1. The zoological aspect. 



2. The palseontological evidence. 



3. The argument from geology. 



VICTORIA institute tkansactions. A 



