724 THE AUSTRALIAN FRESHWATER RHIZOPODA, 



2. Arcella vulgaris. Ehrenberg. 



This species occurs in all freshwater lagoons and creeks suitable. 



It appears that the Australian forms are more rounded at the 

 margin and do not possess so sharp a margin as it is figured for 

 instance by Biitschli in Bronn's Classen und Ordnungen des 

 Thierreichs, Band I., Tafel II., fig. 9a. 



3. LiEBERKUEHNiA AusTRALis. Nova Species 



This species differs from the species described by Cienkovsky, 

 Liebei'kuehnia pakidosa, particularly by its being very much more 

 slender — nearly 6 times as long as broad. 



The nucleus is spherical, the pseudepodia straight and unljranched. 

 The hyaline shell is conical and abruptly cut ofi" at the narrow end. 

 The aperture is situated at the broader end of the conic shell. 



Not very frequent at Botany Swamps. 



4. EcHiNOPYxis AUSTRALIS. Nova species. 



This species appears like an Arcella with spines. There is no 

 hexagonal reticulate sculpture on the shell, which is brownish-grey 

 in color. 



The spines are situated in a circle on the margin of the flattened 

 shell, in length about J of the diameter of the shell, from 7-10 in 

 number, and obtusely pointed. 



The last part resembles Arcella vulgaris in every I'espect. 



Botany Swamps, not very frequent. 



5. Lecquereusia spiralis. Lecq. 



This species has been found in the Botany Swamps, attached to 

 Sphagnum, in November by me. 



6. DiFFLUGiA PYRiFORMis. Perty. 



This species is frequent in Botany Swamps. 



It is very remarkable that of these 6 species only two seem to be 

 specifically Australian, and even these may be identical with 

 species from elsewhere. 



