? Modifications of 

 one species. 



310 DISCUSSION ON THE FAUNA OF [May 5, 



5. Viviparus politus, Frauenfeld. 1 



6. ^e^reys?, Frauenfeld. I ? Modifications 



7. capUlatus, Frauenfeld. [ of one species. 



8. robertsoni, Frauenfeld. J 



9. BytJiinia stanleyi, Smitii. 



10. Lanistes affiiiis, Smith. 



11. solidus. Smith. 



12. ovum, Peters. 



13. purpureus, Jonas. 



14. nyassanus, Dohrn. 



15. Melania tuberculuta, Miiiler. 



16. 7wdicincta, Dohrn. 



17. simonsi, Smith. 



18. polymorpha. Smith. 



19. turritispira, Smith. 



20. pupiforniis, Smith. 



21. nya&sana. Smith. 



22. Corhicula radiata, Parreyss. 



23. astartina. Martens. 



24. Unio nyassaensis, Lea, 



25. Spatha alata. Lea. 



26. nyassaensis. Lea. 



Examples of the following species of Land-Shells were obtained 

 by Sir John Kirk, as quoted by Dohrn : — 



1. Helix mosambicensis, Pfeiffer. 



2. Streptaxis kirkii, Dohrn. 



3. Ennea Icevigata, Dohrn. 



4. Achatina lamarckiana, Pfr. 



5. panthera, Ferus. 



6. JBuliminus stictus. Martens. 



7. catenatus. Martens. 



8. Cyclostoma calcareum, Soiverby. 



A communication was then read from Mr. E. T. Newton, F.Z.S., 



containing the following " Notes on the Geology of British Central 

 Africa " : — 



Altliough so little is definitely known of the Geology of Nyassa- 

 land, that it may almost be said to be a new field for geological 

 exploration, yet we are not altogether \\ithout information as to 

 some points of its general structure. 



Livingstone did not neglect the rocks over which he travelled, 

 and some scattered geological information may be found in his 

 'Missionary Travels' concerning regions bordering on "British 

 Central Africa." 



Additional facts of no little value were made known by Mr. James 

 Stewart, C.E., in the Report of bis journey on the western shores of 

 Lake Nyassa, read before the Geographical Society (Proc. R. Geogr. 

 Soc. vol. iii. 1881, p. 264). 



