IN" 



descriptions and figures of these additional forms of Cladocera. 

 reserving for a future paper my account of the Copepoda and 

 Ostracoda. 



The mud that yielded the several species described in the 

 sequel, was collected by Mr. Archibald Archer, during the spring 

 (March) of 1885. at Kockhampton, Queensland, from different 

 localities in the neighbourhood of that town, and kindly sent me, 

 carefully embaled and marked as to locality. It safely arrived 

 in Christiania on the 29th October same year, and the localities 

 were registered at once in my note-book, the mud being , put 

 aside in separate compartments for subsequent experiments. 



Owing to the cold weather during the whole spring of the 

 following year, I was obliged to defer commencing my experi- 

 ments till the last days of May. By that time a number of 

 aquaries of different sizes were ready to receive small parcels of 

 the mud, these parcels having been previously dissolved in pure 

 spring-water. Each aquary was carefully labelled, both as to 

 the locality, from which the mud had been obtained, and as to 

 the date when the hatching operations began. 



Although the utmost care was taken in preparing the aqua- 

 ries. yet in a comparatively small number only did the hatching 

 of the ova contained in the mud, proceed successfully, and hence 

 the greater part had to be removed as unserviceable. But as 

 new aquaries were provided from time to time in place of those 

 rejected. I at length succeeded in getting hatched Entomostraca 

 from every locality registered. Moreover, by allowing the water 

 in some of the aquaries, at the end of the autumn, to evaporate 

 and keeping the bottom-residue in a dried state the winter over. 

 I had the satisfaction the following summer, that of 1887, on 

 again pouring upon it fresh water, to see after some time man) 

 of the forms reappearing and now in far greater number, these 

 individuals having evidently been hatched from ova deposited in 

 the mud in the course of the preceding sumr 



The results of my experiments during these two 

 are on the whole rather more satisfactory than those 

 in 1884, a circumstance partly due to the present material bem 



summers 

 attained 



