20 G- O. Sars. 



Nos. 1, 2, etc., without any characteristic whatever. In my 

 aquaria I have found 2 species of this genus, one of which 

 I regard as new to science, whereas the other has previously 

 been described from another part of the world. 



5. Ceriodaphnia Bigaudi, Eichard. 



Ceriodaphnia Bigaudi, Richard, sur quelques animaux inférieurs des 

 eaux douces du Tonkin. Mém. Zool. de France, T. Vu, p. 239. 



Remarks. — A detailed description of this form 

 has been given by the present author in a paper on South 

 African Entomostraca, published in the Proceedings of the 

 Christiania Society of Sciences for 1895. It has subsequently 

 been identified by Dr. v. Daday with the Australian form, 

 likewise described by the present author as G. cornuta; but 

 I am not quite assured that this identification is correct. 

 It is true that a horned variety of the present species also 

 exists; but the form of the head, as also the sculpture of 

 the shell, is somewhat different, and the posterior projection 

 of the carapace is scarcely bipartite, as in the Australian form. 



Occurrence. — This dwarfed form appeared in the 

 greater number of my aquaria, and in some of them multi- 

 plied very abundantly. The aquaria were prepared with 

 mud partly from Sâo Paulo, partly from Itatiba, and partly 

 from. Ipiranga. The horned variety was found only in 

 those prepared with mud from Itatiba, and always quite 

 occasionally. 



Distribution. — Although the occurrence of this 

 species in Australia may still be questionable, its geogra- 

 phical distribution has proved to be very extensive. It was 

 first found, for instance, as far east as Tonkin, and Mr. 

 Richard has subsequently recorded it also from Palestine. 

 It is moreover recorded by Mr. Daday both from Ceylon 



