30 G-. O. Sårs. 



Road. In a sample taken by Mr. Whi tel egge from another 

 pond off Botany Road, near Waterworks Bridge, some few 

 specimens of the same form were contained. Moreover, the 

 author has raised this species from mud collected in China. 



Fam. Lynceid.se. 



Gen. Chydorus, Baird. 



12. Chydorus Leonardi, King. 



(PI. 5, figs. 4, 5). 



Chydorus Leonardi, King, 1. c. p. 258, PI. VII C. 



Syn.: Chydorus minor, Lilljeb. M. S. 



This form, first described by Mr. King, is undistinguish- 

 able from a small Chydorus, which is rather common in 

 Norway, as also in Sweden, and for which Prof. Lilljeborg 

 has proposed the name of Chydorus minor. As shown by 

 the figures here given, it is very nearly allied to C. sphæ- 

 ricas (Müll.), but is of much smaller size, and without any 

 trace of the reticulation of the shell characterising that 

 species. The specimen here figured, which measured in 

 length 0,25 mm., was picked up from a sample taken from 

 the Waterloo Swamps, near Sydney. 



Of the same form numerous specimens also developed 

 in some of my aquaria, and continued to live and propagate 

 during the whole season. They were rather active, moving 

 about in the water in a somewhat revolving manner, at 

 times affixing themselves to the walls of the aquarium or 

 to the plants growing in it. 



Occurrence. — Mr. King found this form in several 

 places around Sydney: near Wavely Mills; the waterfall, 



