On Fresh-water Entomostraca. 61 



Seen from above (fig. 5 b), the shell appears less tumid 

 than in the New Zealand form, and exhibits a rather regular 

 rounded ovate form, the greatest width not exceeding the 

 height. The anterior extremity is obtusely pointed, whereas 

 the posterior one appears quite evenly rounded. 



The valves are rather unequal, the right one being the 

 larger, and overlapping the left not only along the anterior 

 extremity, but also in the middle of the dorsal face. Some- 

 what below the centre of each valve, the muscular pits are 

 observed, and just within the anterior edge, as in some 

 other species, there is a narrow, very dark-coloured, marginal 

 area, which exhibits a number of very conspicuous, light, 

 transverse striæ. 



The surface of the shell is smooth, or very slightly 

 granular, being clothed all over with delicate hairs, which 

 at each extremity are more densely crowded together. 



The ground-colour of the shell in living specimens is 

 yellowish and semi-transparent; but along the edges of the 

 valves, as also in their centre, several dark-green, patches 

 occur, which are partly confluent, so as to form irregularly 

 ramified bands. 



The several appendages do not seem to differ in any 

 manner from those in other species of the genus; the caudal 

 rami too (fig. 5 c), exhibit the characteristic, very narrow 

 linear form, with the claws extremely slender and almost 

 setiform. 



Observations. — This form developed rather plenti- 

 fully in some of my aquaria, and cont'nued to live and 

 propagate during the whole summer. In habits, it exactly 

 agrees with the other species of the genus. 



Occurrence. — The mud from which this species deve- 

 loped, was the same parcel, that yielded most of the other 



