[1889. ON SOME FEE SHWATEE OSTEACODA AND COPEPODA. 23 



Gracemere Lagoon. They were both immediately caught by the 

 aid of a dipping tube and submitted to a closer examination 

 under the microscope. No other specimens appeared either this 

 or the following year. But in 1886 having received through the 

 kindness of Mr. Archer a new material of dried mud, I succeeded 

 in raising in several of my aquaries a considerable number of 

 specimens, both males and females. They seemed to thrive very 

 well and soon after having arrived at maturity, the females 

 began to deposit their ova at the bottom of the aquaries, partly 

 to pieces of mud partly to the walls of the vessels. Male and 

 female specimens were at that time often seen in copulation, but 

 I did not succeed in observing the act closer under the micro- 

 scope. At the close of the summer I allowed the water of the 

 aquaries to evaporate and kept the residue in a dried state till 

 the following summer, when fresh water was again poured on 

 the mud. Towards the end of May in the same year there appe- 

 ared in most of these aquaries numerous young, evidently hatched 

 from the ova deposited in the mud the preceding summer. They 

 rapidly increased in size, and in the course of the succeeding month 

 most of them were full-grown, the number of male and female speci- 

 mens being nearly equal. Soon copulation was seen to go on, and 

 the depositing of the eggs continued during the rest of the 

 summer, some of them developing immediately to young, some 

 — probably those deposited in the latter part of the summer — 

 being left undeveloped in the mud. The same mode of proceed- 

 ing as in the last year was now repeated, the mud being dried 

 up and preserved in this state until the following summer, 1888, 

 when the hatching operations were taken up again. The result was 

 very successful, and in some of the aquaries the number of 

 specimens even very considerably increased. I still purpose 

 to continue the experiments, in order to know, how far the 

 domesticating of the species may be extended. Until now I 

 have in fact succeeded in domesticating this form during no less 

 than 3 succeeding years. 



In habits this form is very active, swimming about in the 

 water with great rapidity by the aid of the 2 pairs of antennae, 



