.] ON SOME EBESHWATER OSTRACODA AND COPEPODA. 27 



centre of the shell to the posterior extremity and distinguished 

 by their bright green colour. 



The structure of the several limbs and the soft parts, as 

 observed in their natural situation, when one of the valves has 

 been removed (see PI. Ill, fig. 12), would seem in all essential 

 points perfectly to agree with those in the preceding species, 

 only very slight differences being perceptible in the relative 

 length of the several joints. 



Biological Observations. — I have only been enabled to 

 examine a single specimen of this species, an adult female, 

 which was found on the 13th July 1886 in one of my aquaries, 

 prepared on the 7th June same year. The specimen was imme- 

 diately fished up with the dipping tube and submitted to a 

 closer examination under the microscope, a coloured drawing 

 being made after life. No other specimens appeared either in 

 this or in any of the other aquaries prepared with mud from 

 the same locality. 



In its movements it was somewhat less active than the pre- 

 ceding species, otherwise however agreeing in habits with that 

 form. 



Occurrence. — The mud that yielded this form was collected 

 the preceding year from a Water Hole at Cattle Station — 

 salt at high tides — 20 miles from Eockhampton. From the 

 ne ul several other interesting Entomostraca were raised, 

 partly described in my previous papers. 



Distribution. — The range of tbe species would seem nearly 

 to agree with that of the preceding, including both Australia 

 and the Indian province, Ceylon, where it was first detected by 

 the Rev. A. Haly. 



Gen. 2. Stenocypris, n. 

 Generic Characters. — Shell very narrow and elongate, 

 height by far not attaining half the length, ventral margin 

 distinctly sinuated in front of the middle. Valves subequal, free 



