310 DISCUSSION ON THE FAUNA OF [May 5, 



5. Viviparus politus, Frauenfeld. '\ 



6. ^e^reysz, Fraueufeld. I ? Modifications 



7. capillatus, Frauenfeld. [ of one species. 



8. ?'obei'isoni, Frauenfeld. J 



9. Bythinia Stanley i, Smitri. 



10. Lanistes ctffinis, Smith. 



11. solidus. Smith. 



12. ovum, Peters. 



13. pui'pureas, 3on^?,. 



14. nyassaniis, Dohrn. 



15. Melania tuberculata, Midler. 

 I 6. nodicincta, Dohrn. 



17- simonsi, Smith. 



18. polymorpha^^mith. ? Modifications of 



19. turritispira. Smith, j one species. 



20. pupiformis. Smith. 



21. nya&sana. Smith. 



22. Corhicula radiata, Parreyss. 



23. asiartina, Martens. 



24. TJnio 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 kirJdi, Dohrn. 



3. Ennea Icevigata, Dohrn. 



4. AcJiatina lamarcJdana, Pfr. 



5. panthera, Ferus. 



6. Bnliminus st ictus, Martens. 



7. catenatus. Martens. 



8. Cydostoma calcareum, So^verby. 



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

 containing the following "Notes on the Geology of British Central 

 Africa " :— 



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

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

 exploration, yet we are not altogether without 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 his journey on the western shores of 

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

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



