1907.] MEDUS.E FROM AFRICAX LAKES. 655 



Family PETASID^. 

 Radial canals 4 (or 6) in number ; stomach without a peduncle. 



Subfamily 1. Petachnidje. 

 Sense-organs, projecting clubs. 



Petasus^ Petasata^ Dipetasvs, Petachnum. 



Subfamily 2. 01indiada\ 

 Sense-organs, enclosed in vesicles. 



Group A. Tentacles without adhesive discs. 

 Marine forms. 



Aglauropsis (? including Ma'.otias). 

 Gossea. 



OUndias (? including Hcdicalyx). 

 Freshwater forms. 



Limnocodium. Gonads radial, sac-like. Vesicles of 

 sense-organs elongated and continued into 

 velum. 

 Limnocnida. Gonads manubrial. Vesicles of 

 sense-organs spherical or ellijDSoidal. Asexual 

 reproduction by budding. 

 Group B. Tentacles with adhesive discs. 



Gonionemus, Gonionemoides, Yallentinia, Olindioides. 



References. 



1893. GtJNTHEE,, R. T. — "Preliminary Account of the Freshwater 



Medusa of Lake Tanganyika [Limnocnida tanganicce)." 

 Ann. Mag. Nat. Hist. ser. 6, xi. pp. 269-275, pis. xiii. & xiv. 



1894. GtJNTHER, R. T. — " A further Contribution to the Anatomy 



of Limnocnida tangconicce." Quart. Journ. Micr. Sci. xxxvi. 



pp. 271-293, pis. 18-19. 

 1894. GuERNE, Jules de. — " On a Med visa observed by Dr. Tautain 



in the River ISTiger at Bamakou (French Soudan)." Ann. 



Mag. Nat. Hist. ser. 6, xiv. pp. 29-34. 

 1903. Gravier, C. — "Sur la Meduse du Victoria ISTyanza." 



Comptes rendus Acad. Sci. cxxxvii. pp. 867-869. 



1903. Goto, Seitaro. — The Oraspedote Medusa OUndias and some 



of its natural allies. Mai-k Anniversary Volume, pp. 1-22, 

 pis. i.-iii. 



1904. Moore, J. E. S.— The Tanganyika Problem. 



1904. Browne, Ebw. T. — " Hydromedusae." Fauna and Geogr. 



Maldive Archipelago, voL ii., Cambridge. 

 1906. CuNNiNGTON, W. A. — "Third Tanganyika Expedition." 



' Natiu-e,' Ixxiii. p. 310, 1906. 

 1906. Browne, Edw. T. — "On the Freshwater Medusa Zim^jocmc^a 



tanganicce. and its Occurrence in the River Niger." Ann. 



Mag. Nat. Hist. ser. 7, xvii. pp. 304-306. 

 Proc. Zool. Soc— 1907, No. XLIV. 44 



