On some Freshwater Ostracoda and Copepoda, raised 

 from Dried Australian Mud. 



By 



G. 0. Sars. 



(Read at the Meeting held 8th March 1889. — Section for Mathematics 

 and Natural Science). 



Introductory. 



The present memoir forms a supplement to a series of 

 papers published by the author in this Journal and giving the 

 results obtained in artificially hatching and domesticating Au- 

 stralian freshwater Entomotraca. In the former papers only 

 of the order Branchiopoda (Phyllopoda and Cladocera) was trea- 

 ted; in the present I propose to describe the several forms of 

 Ostracoda and Copepoda, appearing in my aquaries together 

 with the Branchiopoda. Of Copepoda only 2 species of the 

 genus Diaptomus were observed, whereas of Ostracoda no less 

 than 7 different forms, belonging to several distinct genera, 

 have been successfully hatched and in most cases observed 

 during numerous succeeding generations. The domesticating of 

 freshwater Ostracoda would seem on the whole to be attended 

 with far less difficulties than is the case with Branchiopoda and 

 Copepoda, probably owing to the more hardy nature of the 

 former animals. In fact, the experiments in hatching exotic 

 freshwater Entomostraca formerly instituted by the late Dr. 

 Baird have almost exclusively yielded species of this order. 



Some of the Australian species described below I have 

 succeeded in domesticating in my aquaries during no less than 



