Victoria Nyanza or Lake OukSrSioS. 123 



I. Gastropoda. 



1. Limncea Debaizei^ Bourguignat. 



Limnfpa Debaizei, Bourguignat, Bull. Soc. Mai. France, 1887, vol. iv. 

 p. 268. 



This species also occurs at Bagamoyo (^Bourg.). It evi- 

 dently is very closely allied to L. natalensis, Krauss. 



2. Physttj sp. 



Physa, sp., Martens, SB. Gesell. nat. Freund. Berlin, 1870, p. 103. 



Hah. South-west shore. 



Perhaps P. nyassana^ Smith [Martens). 



3. Planorhis choanomphalicsj Martens. 

 Planorhis choanomphaltcs, Martens, /. c. p. 103. 

 From the south-west shore. 



4. Melania tuberculata, Miiller, var. 



Melania iuhereulata, Miiller, var.. Martens, I. c. p. 104 ; Bourguignat, 

 Moll. fluv. du Nyanza Oukerew^, 1883, p. 4. 



Hah. South and south-west shore. 



5. Viviparus ahyssinicus^ Martens, 

 Vivipara abijssinica, Bourguignat, /. c. 1883, p. 4. 

 Hab. South end of the lake. 



6. Viviparus ruhicundus, Martens. 



(PI. XII. fig. 3.) 



Paludina rubicunda, Martens, I. c. p. 104; Smith, P. Z. S. 1888, p. 53, 

 as Paludina unicolor, var. 



Hah. South-west shore {Martens) ; Nile region between 

 3° and 14° N. lat. {Speke, in B. M.) ; Albert Nyanza 

 {Smith). 



This is a very pretty species, distinguished by its pinkish 

 colour and rounded whorls. 



7. Viviparus capillatus, Frauenfeld. 

 Paludina capUlata, Martens, /. c. p. 104. 



Hab. South shore [Martens) ; Lake Nyassa [Frfid.). 



9* 



