574 



DR. W. A. CTTNNTNGTUN ON THE 



the purely aquatic and tlie purely terrestrial forms. Yet this is 

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

 lie on the border-line, but even the true earthworms in the 

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

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

 species as well as the ti-ue aquatics have been retained, those 

 forms being- excluded winch are generally recognised as earth- 

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

 with specific names such as tcmganyikm have been omitted fjom 

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



Aquatic 01igoch?eta are recorded from five out of the six 

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

 many more records will be forthcoming. The list which follows 

 gives the impression of ])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 ISTyanza. In a few cases, i-ecords have been inserted 

 without specific determination. "While these are unsatisfactory, 

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

 particular genus. 



Table of Distribution of OligocJueta f. 



Name of Species. 



Family Naidomoepha. 



Naidium sp ... P 



Nais sp 



Dero sp 



Anlopliorus stuhlmanni ... E 



Pristiiia longiseta 



Family Alluroidid^. 



Alluroides tanganyikje P 



Family MEGASCOLECiDiE. 



Siih-family OcnerodrilinrB. 

 Ociierodrilus (Ilyogeuia) 



cunningtoiii E 



Pygma3odrilus affinis E 



„ bipunctatus ... 



„ bulcobensis E 



grawerti E 



„ kivvuensis 



Family Glossoscolecid^. 

 Subfamily Criodrilince. 



Alma emini ... E 



stuhlmanni ... P 



9 genera 3 P. 4 P. 



14 species 2 E, 1 P. 4 E, 2 P. 



(3) (6) 



Tangan- Victoria ^ Albert j^..^,^ 



yika. Nyanza. • JNj-aiiza. 



Otlier parts of 

 the world. 



Europe, America. 

 IJhode.sia. 



P P E. Africa. 



E 



P ... E. Africa. 



3 P. 2 P. 1 P. 



3 P. 



2 P. 



IE, IP. 

 (2) 



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

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

 (120: 121), who gives a bibliography. 



