4 G. O. Sars. 



another paper, to be published shortly, I intend to treat of 

 the other Entomostraca raised from the mud. 



Although a considerable number of larvæ were suc- 

 cessfully hatched in my aquaria, it was only a comparatively 

 small number of them that accomplished their whole develop- 

 ment, and but very few specimens grew to their full size. Not- 

 withstanding this, all the developmental stages, both larval and 

 postlarval, have been carefully studied, and numerous draw- 

 ings from living specimens executed, the most instructive 

 of which are reproduced, by the autographic method, on the 

 accompanying Plates. 



In a previous paper, inserted in the Transactions of 

 the Scientific Society of Christiania for 1887, and containing 

 a description of the remarkable Phyllopod, Cyclestlieria 

 Hislopi (Baird), which I succeeded in raising from mud col- 

 lected near Pockhampton, the development is also treated 

 of in detail. But the development of this form is very 

 different from that in other Phyllopods, the brood being, as 

 in the Cladocera, kept within the shell of the parent until 

 their full development, whereby any true metamorphosis in 

 this form is excluded. 



Now it appears to me rather interesting to compare 

 therewith the development of the present Phyllopod, which 

 like most other forms of the sub-order, passes through a very 

 pronounced larval metamorphosis On the whole, the develop- 

 ment of the present form agrees very closely with that of 

 Limnadia lenticularis Lin., which also I have had an op- 

 portunity of studying in detail. 



