574 



DR. \V. A. CUNNTNGTON ON TITK 



tlie purely aquatic and the purely toiTe.stria.l t'oi-ms. Yet this is 

 not a simple task, for not only are there a ntnnher of types which 

 lie on the bordei--line, but even the true eaithworuis in the 

 tropics are seniiaquatic in habit, living in very wet places not far 

 from water. For the purposes of tliis paper, the border-line 

 species as well as the true aquatics have been retained, those 

 forms being excluded v/hich ai'o generally recognised as earth- 

 worms. It follows from what has been said, that even worms 

 with specific names such as tcmgcmyikie have been omitted fi om 

 the list when the name has been applied to a terrestrial species. 



Aquatic Oligochreta are recorded from five out of the six 

 lakes under review, but there is reason to suppose that a good 

 many more I'ecords will be forthcoming. The list which follows 

 gives the impression of l)eing incomplete, yet it incorporates, I 

 believe, all the available information. Since a number of these 

 forms are small and inconspicuous, it is not unlikely that they 

 have hitherto escaped notice. No species have been reported from 

 Edward Nyanza. In a few cases, I'ecords have been insei'ted 

 without specific determina,tion. While these are unsatisfactory, 

 they still have a certain value, as proving the occurrence of a 

 particular genus. 



Table of Distribution of Oligoclusta ' 



Name of Species. 



Tangan- Victoria 

 j'ika. Nyaiiza. 



Nyasa. 



Albert 

 Nyaiiza. 



Otlier parts of 

 the world. 



Family Naidomoepha. 



Naidium sp ... P 



Nais sp ... ... P 



Dero .'ip ... ... P 



Anlopliorus stuhlraaiini ... E 



Pristina lougiseta ... P ... ... Europe, America. 



Family Allueoididjj. 



Alluroides tanganyikaj P ... ... ... ... IMiodesia. 



Family MEGASCOiECiD.as. 



Sub-family Ocnerodrilince, 

 Ocnerodrilus (Ilyogeiiia) 



cunningtoiii E 



PygmaBodrilus affinis ... E 



„ bipuiictatus ... ... P P E. Africa. 



„ bukobensis ... ... E 



,, grawerti E 



,, kiwuensis ... ... ... ... E 



Family GLOSSOSCOLECiDiE. 



Subfamily Criodrilince. 



Alma emini ... E 



., stuhlmauni ... P ... p E.Africa. 



9genera 3 P. 4.P. 3P. 2 P. IP. 



14.species 2 E, 1 P. 4E, 2P. 3 P. 2P. IE, IP 



(3) (6) (2) 



t The records of these forms from the African lakes are somevvliat scattered in the 

 literature of the subject. Refer especially to Beddard (12 : 13) and to Michnelsen 

 (120: 121), who gives a bibliography. 



