34 G. O. Sara. 



The antennæ are comparatively short, and of the usual 

 structure. 



The tail (fig. 9) is of moderate size, and almost of uni- 

 form breadth throughout, being obtusely truncated at the 

 tip, with the posterior corner rounded off. The post-anal 

 angle is but little prominent, and is obtuse. The posterior 

 edge below it appears very slightly flexuous, being some- 

 what convex in the middle. The ante-anal denticles are 

 very small, almost hair-like, and occupy the outer half of 

 the edge, being continued around the distal corner. The 

 terminal claws are rather strong and curved, having each 2 

 distinct secondary denticles at the base, not found in the 

 European species P. aduncus. 



As in most other Lynceidæ, the matrix never contains 

 more than 2 ova or embryos, which are generally juxtaposed. 



The body in living specimens is semi-pellucid, thus 

 showing through the integuments several of the inner organs, 

 especially the dark-coloured and twisted intestinal tube. It 

 generally exhibits a yellowish or light corneous hue. 



Observations. — Of this species some specimens were 

 found in one of my aquaria, all of them females. They 

 did not, however, multiply to any greater extent, and in the 

 latter part of the summer, this form wholly disappeared. 

 The animal is rather agile, moving quickly through the water 

 in much the same manner as the species of Chydorus. Very 

 often it was also seen cliugiDg to the wall of the aquarium 

 or to the plants growing in it. 



Occurrence. — The mud, from which I raised this spe- 

 cies, was taken by Mr. Whitelegge from a pond opposite 

 Lachlan Street, Bourke Street; and in a sample from the 

 same locality, a considerable number of specimens was con- 



