THE TANGANYIKA PROBLEM. 
i >S 
CRUSTACEA. 
Brachyura. 
1. Limnothelphusa maculata (Cunnington) 
2. Platythelphusa armata (Milne Edwards) 
Atyida;. 
3. Limnocaridina Tanganyika; (Caiman) 
Pal.'F.monid.-e. 
4. I’alremon moorei (Caiman) 
MOLLUSC A. 
1. Limnrea debaizei Bgt. 
2. ,, jouberti Bgt. 
3. ,, laurenti Bgt. 
4. ,, natalensis Krauss. 
5. Isidora conlboisi Bgt. 
6. ,, randabeli Bgt. 
7. Physopsis tanganyicre Marts. 
8. Planorbis sudanicus Marts. 
9. ,, tanganicanus Bgt. 
10. ,, tanganicensis E. Sm. 
11. Ampullaria bridouxi Bgt. 
12. ,, ovata Ol. 
13. Lanistes jouberti Bgt. 
14. Vivipara sp. ? 
15. Neothauma E. Sm. 
16. Cleopatra guillemei Bgt. 
17. Melania tuberculata Mull. 
18. ,, tanganyicensis E. Sm. 
19. ,, horei E. Sm. 
20. Typhobia horei E. Sm. 
21. Bathanalia Howesei Moore. 
22. Bythocerus iridescens Moore. 
23. ,, mimor Moore. 
24. Chytra kirkii Moore. 
25. Limnotrochus Thomsoni E. Sm. 
26. Paramelania Damoni E. Sm. 
27. ,, cranigranulata E. Sm. 
28. Tanganyicia rufofilosa Crosse. 
29. Speika zonata Woodw. 
30. Nassopsis nassa E. Sm. 
31. Syrnolopsis lacustris E. Sm. 
32. Stanleya neritinoides Bgt. 
33. Rumella callifera Bgt. 
34. Unio bohrni Marts. 
35 - >> gerrardi Marts. 
36. ,, calathus Bgt. 
37. „ horei E. Sm. 
38. ,, burtoni Woodw. 
39. ,, rostralis Marts. 
40. ,, tanganyicensis E. Sm. 
41. ,, thomsoni E. Sm. 
42. Spatha tanganyicensis E. Sm. 
43. Mutela soleniformis Bgt. 
44. Iridina spekei Woodw. 
45. Burtonia tanganyicensis E. Sm. 
46. Corbicula radiata Phil. 
1. Arachnoidia lankesteri (Moore) 
1. Lemnochnidia. 
1. Spongilla tanganyikae Evans. 
2. ,, moorei Evans. 
POLYZOA. 
HYDROZOA. 
SPONGES. 
3. Potamolepis weltneri Moore. 
i 
Associated with the above there are in Tanganyika some 
conspicuous Protozoa, chief among which is a curious peri- 
dinia-like form possessing cilia. This organism forms the 
yellow scum on the lake which was noticed by Livingstone 
in his last journey. Associated with it there is a large 
