FAUNA OF THE AFRICAN LAKES. 



559 



the exceptional opportunities tliey are known to possess for 

 obtaining world-wide distribution, cainiot aftbrd evidence of the 

 same value as the higher forms. When — as is particularly 

 the case among the Cladocera — even specific forms of cosmo- 

 politan range reappear in the great lakes, it becomes clear that 

 the precise geographical distribution of such species is a matter 

 of no great significance. At the sniiie time, tlie possibility is not 

 excluded that the lakes may difter in tlieir suitability to harbour 

 certain types, while it is highly probable that new types can and 

 will develope in some cases, constituting species or even genera 

 of an endemic nature. Thus a study of the distribution of these 

 forms in the lakes of Central Africa is nevertheless not devoid of 

 interest, and may indeed furnish testimony of some importance. 



EUCOPEPODA. 



The Eucopepoda so far observed in the lakes with which this 

 paper is concerned reach the not inconsiderable total of 54 

 species. Of these, more than half (31) have been found in 

 Tanganyika, to which lake a lai'ge proportion exclusively belong. 

 There is every i-eason to believe that further investigation will 

 bring to light additional forms, particularly from Victoria 

 Nyanza and the smaller lakes, which, in this respect, have 

 received less attention than Tanganyika and Nyasa. 



Name of Species, 



Family Centeopagidj:. 

 Diaptomus galeboides J 

 mixtus .... 

 africanns 

 stulilmaniii 

 simplex .... 

 cuiiningtoni 

 kv99pelini . 



Family Harpacticid^, 

 Caiithocamptus sclir5deri 

 Attheyella decorata 



„ grandidieri ... . 

 Dactylopus jugm'tlia . . . . 

 Schizopera inopinata .... 



„ validior 



„ consimilis .... 



„ ungulata 



„ minuticornis . 



Tdhle of Distribution of Eucoiiepoda t. 



Tangan- Victoria 

 yika. Nyanza. 



Nyasa 



P 



Albert Edward 

 N3^anza. Nyanza. 



Kivu. 



Other parts of 

 the world. 



E, Africa. 



E. Africa. 



Asia, S. America, 



S. America, New Guinea. 



Asia, New Guinea. 



t Detailed information concerning a large proportion of these species is given by 

 Sars (151). The other sources of most importance are Daday (76, p. 106) and 

 Mrazek (139). For the Lernaiidye consult Cunnington (73). 



X I follow Sars (151, p. 34) in assuming that this form, which is one of the 

 commonest and most cliaracteristic species of Lake Victoria, is not identical with 

 the Egyptian _D. gaJehi Parrois, as supposed by Mrdzek and Dadaj'. 



§ No!: actually recorded from the lake itself, but from within its drainage area. 



