Freshwater- Shells JTom Central Africa. 149 



21. Lamstes ovum (Peters). 



Hab. Bubu. 



22. Lamstes libycus (Morelet). 



Hab. Longa (Ferhdni). 



This is a well-known West-African form. 



23. Paludina, sp. ? 



A series of fifteen specimens from Huala River miglit 

 possibly be considered an extreme variety of P. unicolor. 



24. Paludina^ sp. n. 



Hab. Victoria Nyanza, south shore {Emm 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 tuberculatay Muller. 

 Hab. Huala fliver. 



26. Cleopatra ferrugineaj Lea. 

 Hab. Longa {Ferhdni). 



27. Cleopatra Guillemeiy Bourguignat. 

 Hab. Hadako, Ugogo. 



28. Physopsis Leroyi^ Grandidier. 

 Hab. Bubu. 



29. Gorbicula radiata^ Parreyss. 

 Hab. Victoria Nyanza, south shore. 



30. TJnio^ sp. 



Hab. Hasvea. 



A single specimen only, closely resembling U. Edwardsi- 

 anusj Bourguignat, from the Victoria Nyanza. 



31. Spatha rubens, Lamarck. 



Hab. Njamagodjo, Victoria Nyanza; also Niangivira, 



Ugogo. 



