ARGHIV FOR MATHEMATIK OG NATURVIDENSKAR. R. XXII. Nr. 6. 



Description of Iheringula paulensis, a o. sars 



a New Generic Type of 



M a c I* o t li r i c i d se 



from Brazil. 

 With 2 autographic plates. 



By G. O. Saes. 



Introduction. 



In the present paper, I propose to describe in detail a 

 rather interesting new Clodoceran, which, together with a 

 number of other fresh- water Entomostraca, was raised, during 

 the last 2 summers, from dried material kindly forwarded 

 to me by Dr. H. von Jheeing, director of the «Museu 

 Paulista» in Sao Paulo, Brazil. This Cladoceran forms the 

 type of a new genus of the family Macrothricidæ, and I 

 have much pleasure in dedicating it to the said distinguished 

 naturalist, to whom I am also indebted for several other 

 parcels of dried mud, and for some alcoholic samples taken 

 by him in the neighbourhood of Sao Paulo. By the exami- 

 nation of these samples, and especially through the hatching 

 operations instituted here in Christiania, I have been enabled 

 to make rather a close acquaintance with the fresh-water 

 Entomostraca of that region hitherto almost unexplored as 



