BRANCHIURA FROM LAKE TANGANYIKA. 283 



of the species at present known to occur in the lakes in 

 question : — - 



Tanganyika. 



Dolops ranaruvi Stuhhnann. 

 Argidus incisus, sp. n. 



„ rubropionctatus, sp. n. 



,, personatus, sp. n. 



,, exiguus, sp. n. 



,, angusticeps, sp. n. 



,, stricot'us, sp. n. 



,, ruhescens, sp. n. ■' 



,, africanus Tliiele. 



Victoria Nyanza. 



Dolops ranarum Stuhhnann. 

 Argidios africanus Tliiele. 



Nyasa. 



Dolops ranarum Stuhlmann. 

 Arguhts africanus Thiele. 

 Chonopeltis inermis Thiele. 



Albert Nyanza. 



Argulus africanus Thiele. 



By the kindness of Dr. Caiman I have been permitted to 

 examine the African specimens belonging to the British Museum. 

 They are of species already known to science, but as, in one 

 instance, they affoi-d a record of a new locality, and as no notice 

 of them has been published, they will be referred to in their 

 place in the systematic part of this paper. 



To illustrate the general appearance of the new species, I have 

 made use of photographs taken with a low-power lens from the 

 actual specimens themselves. The diificulties in the way of 

 obtaining reasonably good results from objects which are by 

 no means flat are very considerable, but I think that the photo- 

 graphs in question are really more satisfactory for the purpose 

 than drawings would be. They were made with a special photo- 

 micrographic lens in the Zoological Laboratory of King's College, 

 London, and I have to express my indebtedness to Prof. Dendy 

 for allowing me to work in the laboratory, and also to him and 

 to Mr. R. W. H. Row for affording me the benefit of their 

 experience with the apparatus. 



2. Systematic Notes and Description of Neio Species. 

 Family ArguliDjE. 



Dolops ranarum Stuhlmann. 



Gyropeltis ranarum Stuhlmann, Zool. Jahrb., Syst. Bd. vi. 

 1891, p. 154. 



