FAUxMA OF THE AFRICAN LAKES. 



551 



and it is quite surprising to find that in this instance Tanganyika 

 does not take the first place with the largest numher of difierent 

 forms. This position is held by Victoria Nyanza with 18 species, 

 but Tanganyika follows very closely with 17, and maintains its 

 reputation to some extent by exhibiting the highest number of 

 endemic species and even certain endemic generii. In the 

 following table no column is provided for Ivivu, since there is 

 only a doubtful I'ecord of Lamellibranchs from that lake *. 



Table of Distribution of LamelUhranchiata f. 



Name of Spe;;ies. 



Tangan- 

 yika. 



Victoria 

 Nyanza. 



Nyasa. 



Albert 

 Nyanza. 



Edward 

 Nyanza. 



Other parts of 

 the world. 



Family Cteenid^. 



Corbicula astartiua 



„ cunningtoni 



„ radiata P 



Family Sphjeeiid^. 

 Sphairium nyanzie 



„ stuhlmanni 



„ victoria; 



Eupera parasitica 



Family Unionid^:. 



Unio acuminatus 



,, segyptiacus 



„ bakeri 



„ bohmi E 



„ borellii 



„ burtoni E 



„ cailliaudi 



„ calathus E 



„ emini 



„ gerrardi E 



„ grandidieri 



„ hauttecoeuri 



„ horei E 



„ hypsiprymnus 



„ Idrki 



,, lechaptoisi 



„ liederi 



„ lourdeli 



., monceti 



„ mossambicensis 



„ multicolor 



,, ngesianus 



„ nyassaonsis 



„ rostralis ' E 



„ ruellani 



„ stuhlmanni 



Nile. 



Nyasaland. 

 E. Africa. 



Zambezi, E. Africa. 



Angoni Laud. 



* Speaking of the fauna of Kivu, Moore refers to "one or two species of fresh- 

 water bivalves, closely allied to the Unios found generally in the African lakes" 

 (137, p. 129). Against this assertion is to be set the statement of the naturalist 

 at the head of the German Central Africa Expedition, '• Ebenso scheinen lebende 

 Lamellibranchier zu fell 1 en " (156, p. xi\). 



t The principal sources which may be consulted for information on the Lamelli- 

 branchs are Smith (170) and von Martens (116). 



