12 G. O. Sårs. 



multiplied in the usual parthenogenetic manner until the 

 close of the season, when the sexual propagation took place, 

 the females becoming at that time provided with ephippia 

 and males specimens appearing. In habits this form exactly 

 agreed with the other species of the genus, the specimens 

 being rather agile and keeping themself constantly sus- 

 pended in the wather, through which they moved in a 

 jerking manner, the head generally turned upwards. 



7. Moiuodaphnia Macleayi (King). 



Occurrence. — Several specimens of this form were 

 picked up from the sample taken by Mr. Iversen at the 

 Helvetic Estate, Sumatra. It did not, however, appear in 

 any of my aquaria. 



Distribution. — Australia (iiLzn^), Ceylon [Brady), Brazil 

 (the present author). 



FAM. BOSMINIOÆ^. 



8. Bosmina cornuta (Jurine). 



Occurrenc e. — Two small, but adult ovigerous females 

 of this form were secured from one of my aquaria pre- 

 pared with mud from China. 



Distribution. — Europe, Central Asia. 



FAM. MACROTHRICIDiE. 



9. Macrotlirix laticoruis (Jurine). 



Occurrence.^Tliis form also easily recognizable by 

 the minutely jagged dorsal margin of the carapace, appeared 

 in some of my aquaria prepared with mud from China. 



Distributio n.— Europe. 



