Geol. Mag. i! 



Decade IV, Vol. III. PI. XI. 



5%« *: ;^^W^£t; ■; 



The Southern Shores of the Victoria Nyanza {a/ter Gedge). 



The Western Wall of Tanganyika [after Giraud). 



Two types of African Lake-Shores. 



Reproduced by permission of Mr. John Murray, from Dr. Gregorys "Great Rift Valley. 



