Entomosiraca of the Albert Nyanza. 81 



Dr. Leiper was unfortunate enough to lose his nets, and 

 thereby his opportunity for further work in this direction. 

 These tow-nettings were taken at the north end of Lake 

 Albert opposite Magungo. On his return home, Dr. Leiper 

 kindly handed over to me his two tubes of plankton, with a 

 view to their examination. 



Certain of the groups of organisms thus collected have 

 already been reported on by experts,, notably the Algae by 

 Prof. G. S. West (Journ. Bot. vol. xlvii. 1909, p. 241) and 

 the Rotifera by Mr. C. F. Kousselet (Proe. Zool. Soc. 1910, 

 ]). 797), but no account has been given as yet of the Entomo- 

 straca. 



In March 1908 the German Central Africa Expedition, 

 under the leadership of the Duke of Mecklenburg, visited 

 Lake Albert and made considerable colilections, including, of 

 course, samples of the plankton. Although the scientific 

 results of this expedition are still in course of publication, 

 the sections dealing with the Cladocera and Copepoda have 

 already appeared, and naturally treat; of fonns taken for the 

 most part by the tow-net. 



The collections of Ostracoda and Copepoda which ]j made 

 in Tanganyika, Nyasa, and Victoria Nyanza were very fully 

 reported on by Prof. G. 0- Sars ; therefore it was to him, 

 that I sent Dr. Leiper's Albert Nyanza material, and I am 

 very grateful for the trouble he has taken in examining it.. 

 On comparing the list of forms, identified by Prof. Sars with 

 that given by van Douwe in his report on the Copepoda of 

 the German Expedition (Wiss. Eigebnisse d. \). Zentral- 

 Afrika Exp. 1907-1908, Bd. iii. 1912, p. 492), I was 

 surprised to find that the former contained twice as many 

 species of Copepoda, in spite of the paucity of material. 

 Prof. Sars's list also records the occurrence in the lake of a 

 species of Ostracod,. which thus renders its publication 

 additionally important. 



Jt will, perhaps,, be worth while to examine the few 

 records of Entomostraca from the lake, and then to give a 

 complete list of the forms which are at present known to 

 occur. The three species of (JopepoclfS described, by van Douwe 

 [op. tit.) are as follows :. — 



Cyclops leuckarti, Glaus \ 



oithonoides, Sars. 



Ergasilus kandti, sp. n. 



* Van Douwe cites this species on p. 489 as C. leuckarti,, Sars, which, 

 is obviously an oversight. lie refers to it quite correctly in a more 

 recent paper on the Copepoda of the Second German Central Africa 

 Expedition. 



Ann. & Mag. N. Hist. Ser. 8. Vol. xvi. 6 



