248 On some of the Species of Daphniade 
joint has also two jointed setz springing from one of the 
wrinkles in its outer surface, about half way up; anda 
short-jointed seta from the outer edge of its extremity. 
The extremity of the abdomen is more distinctly jointed 
than in most species of this genus. It has two small 
processes, one springing from each articulation. 
The extremity terminates in two long spines, which are 
sometimes deeply serrated, at other times plain. 
The anus is surrounded by a circle of 12-14 strong 
curved spines. 
The colour is variable. Those near Sydney are of a 
transparent chestnut colour. At Port Stephens, in a small 
pond, I found a large variety of a pinkish colour; while in 
the River Karuah the specimens were small and of a brown 
colour, marked with bands of a deeper colour. 
The black spot is often seen of an elongated form. I 
have seen one end moved as the labrum moved, with which 
it appeared to be connected. 
This species is remarkably like Daphnia vetula (Batrp), 
although easily distinguished by the particulars of the 
antennee, superior and inferior, as well as the character of 
the extremity of the abdomen. It even more closely 
resembles the figures of D. sima in Jurtn£, though I dare 
not pronounce the species to be identical. 
The normal state is represented by fig. B. 
When the female becomes gravid more room is required, 
and the shape becomes more ovate, as in fig. A. 
I have not as yet found the male. 
Its habits are not very active. It swims fast, and yet 
it often clings to the sides of the glass in which it is kept, 
or to the stems of weeds, or the roots of Lemne, by 
throw‘ag back its inferior antenne ; and in this position 
