THE TANGANYIKA PROBLEM. 
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Fishes — continued. 
Characinid.e. 
Alestes rueppellii Gthr. 
Cyprinodontid.e. 
Fundulus tceniopygus Hilg. 
Mormyrid/e. 
19. Mortnyrus oxyrhynchus Geoff r 
20. ,, longibarbis Hilg. 
Lepidosirenid.e. 
21. Protop ter us annectens Ow. 
, , cethiopicus Hack. 
MOLLUSCA. 
Limncea nyanzse Marts. 
,, debaizei Bgt. 
Isidora trigona Marts. 
,, strigosa Marts. 
,, transversalis Marts. 
,, forskali Ehrbg. 
Physopsis ovoidea Bgt. 
Planorbis sudanicus Marts. 
,, choanomphalus Marts. 
,, victorise E. Sm. 
Ancylus stuhlmanni Marts. 
Ampullaria nyanza 1 E. Sm. 
,, gordoni E. Sm. 
,, bukobas Marts. 
,, ovata 01. 
,, emini Marts. 
Lanistes schweinfurthi Ancey. 
Vivipara unicolor Ol. 
19. Vivipara rubicunda Marts. 
20. ,, meta Marts. 
21. ,, phthinotropis Marts. 
22. ,, constricta Marts. 
23. Cleopatra guillemei Bgt. 
24. Bithynia humeroso Marts. 
25. Melania tuberculata Mull. 
26. SEtheria elliptica Lm. 
27. Unio lourdeli Bgt. 
28. ,, hauttecceuri Bgt. 
29. ,, multicolor Marts. 
30. Spatha trapezia Marts. 
31. Mutela subdiaphana Bgt. 
32. ,, bourguignati Ancey. 
33. Sphrerium nyanza. 1 E. Sm. 
34. ,, stuhlmanni Marts. 
35. Eupera parasitica Parr. 
POLYZOA. 
1. Species indt. 
The Victoria Nyanza stands at an altitude of nearly 
4,000 feet. It is higher than either Tanganyika or Nyassa, 
in most parts its waters are shallow and its shores reedy 
swamp fringes, but there are many island archipelagoes 
where the coasts are steep, and the waters which surround 
them deep and rough. In nature the depression in which 
the Victoria Nyanza lies is totally unlike those of most 
of the other African lakes which we have hitherto con- 
sidered. It is, however, very comparable to the depression 
occupied by Lake Bangweolo, the Victoria Nyanza being, 
in fact, nothing more than a gigantic rain puddle, occupying 
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