58 G. o. sabs. [No. 8. 



also this form during numerous succeeding generations and at 

 different seasons, but only female specimens have as yet appeared. 

 The same is also the case with the Chinese species, of -which 

 numerous specimens were domesticated last summer, and like- 

 wise of the very common northern species C. vidua no male 

 has ever been observed. Hence I think, it must be assumed, 

 that also the species of the present genus propagate in an 

 exclusively partenogenetical manner. 



In habits this form nearly agrees with the northern species 

 C. vidua (Miiller). The animal is rather active in its movements, 

 being able to swim with rather considerable speed through 

 the water, as may a priori be concluded from the great deve- 

 lopment of the natatory setae on both pairs of antennas. Very 

 often, however, it is seen quite slowly creeping up the walls of 

 the aquary, at times resting nearly immobile for a long while 

 in the same place. 



Occurrence. — The mud from which this species was raised, 

 came from two different localities, viz., from a Lagoon near 

 Racecower — 4 miles from Eockhampton, and from a Water 

 Hole at Cattle Station — 20 miles from that town. 



