BRANCHIURA FROM LAKE TAKGAXYIKA. 279 



Nshonzi. A single female, associated with specimens of Dolops 

 ranarwm. 



In the collection of the British Museum are other specimens 

 which have been subsequently obtained. They were also 

 associated with a Dolops ranarum. The label reads : — " On 

 skin of fish {^ Male') ? catfish. Lake Victoria. Collected by 

 G. D. H. Carpenter, 6. xi. 11." Five male and fourteen female 

 specimens. 



Albert Nyanza. — As the result of a rather unusual occurrence, 

 we now know of the existence of Argulidte in this lake. In a 

 tow-netting from the lake which was placed in my hands for 

 examination by my friend Dr. R. T. Leiper, Helminthologist 

 to the London School of Tropical Medicine, I found very un- 

 expectedly, a young Argulid. The material was collected by 

 Dr. Leiper in July 1907, when he accompanied the expedition 

 despatched to Uganda by the Egyptian Survey Department, and 

 is of special interest at the present time, being the only col- 

 lection of plankton as yet made in the lake. The tow-netting 

 was taken at the north end of the lake opposite Magungo. 

 While we know of the free-swimming habit of young Argulids, 

 which would render them liable to be taken in the tow-net, it is 

 certainly very exceptional to capture them in this manner, as 

 is evidenced by their complete absence fi^om the extensive series 

 of tow-nettings made during the Third Tanganyika Expedition. 

 It is thus a very happy accident which gives us this additional 

 record. 



I believe the specimen to be a male larval form of A . africanus. 

 The blunt rounded spines or processes on antennae and maxillipeds 

 which are characteristic of the adult, are represented by sharper 

 structures in this individual, but I think there is evidence that 

 this is usual in young specimens. 



River Nile. — In the British Museum collection, associated 

 with the specimens of Dolops obtained by Mr. Loat, and referred 

 to above, there is a single female which I regard as belonging to 

 this species. There are, it is true, points of difference from a 

 typical specimen, yet in view of its general similarity, and since 

 this form is known to occur in the Nile and is commonly found 

 in association with Dolops, it seems desirable to place it here. 

 It was taken from the buccal cavity of a large Heterohranchus 

 bidorsalis, caught at the mouth of Lake No, White Nile, 



3. General Remarks. 



With singular uniformity, all the collections made in Tanganyika 

 prove, to a greater or less degree, the unique character of the 

 organisms inhabiting the lake. The Branch iura are no exception 

 to the rule, for, as a result of this Expedition, we now know 

 that while two species are widely distributed in Africa, they are 

 associated in Nyasa with a single endemic form, but in Tanganyika 

 with no less than seven. Thus in this case again, Tanganyika 



