Freshwater -Shells from Central Africa . 
149 
21. Lanistes ovum (Peters). 
Hah . Bubu. 
22. Lanistes lihycus (Morelet). 
Hah . Longa ( Ferhani ). 
This is a well-known West- African form. 
23. Paludina , sp. ? 
A series of fifteen specimens from Huala River might 
possibly be considered an extreme variety of P. unicolor . 
24. Paludina , sp. n. 
Hah . Victoria Nyanza, south shore ( Emin and Hanning - 
ton). 
This species, which appears to be undescribed, has a very 
long spire and is remarkable also for the acute keel around 
the periphery, which revolves up the spire just above the 
suture. 
25. Melania tuherculata , Muller. 
Hah . Huala River. 
26. Cleopatra ferruginea , Lea. 
Hah . Longa ( Ferhani ). 
27. Cleopatra Guillemei , Bourguignat. 
Hah. Hadako, Ugogo. 
28. Physopsis Leroyi , Grandidier. 
Hah. Bubu. 
29. Corhicula radiata ) Parreyss. 
Hah . Victoria Nyanza, south shore. 
30. Unioy sp. 
Hah. Hasvea. 
A single specimen only, closely resembling Z7. Edwardsi- 
anusy Bourguignat, from the Victoria Nyanza. 
31. Spatha ruhenSy Lamarck. 
Hah. Njamagodjo, Victoria Nyanza; also Niangivira, 
Ugogo. 
