24 GL O. Sars.. 



5. Leydigia acanthocercoides (Fischer). 



A single adult female specimen of this Lynceid was 

 taken up from the same aquarium, in which Simoceplialus 

 vetidus occurred. It was not, however, observed subsequently. 



6. Alona lineata, Fischer. 



Of this species, very seldom met with in Norway, 

 countless myriads developed in all my aquaria. 



7. Chydorus sphœrlcus (Müller). 



Found rather frequently together with the preceding 



species. 



Ostracoda. 



8. Cypris vivons, Müller; var moriüifera. 



This variety, distinguished by a number of rounded 

 nodules at each extremity of the valves, not found in the 

 typical form, developed in two of my aquaria prepared with 

 mud from the swamp of Bon Kamera. 



9. Stenocypris Chevreuxi, G. O. Sars. 

 See above. 



10. Ilyocypris austral! ensis, G. O. Sars. 



Several specimens of an Ilyocypris not distinguishable 

 from the Australian form described by the present author in his 

 paper »On some Australian Ostracoda and Copepoda«, were 

 raised in one of my aquaria prepared with mud from the 

 same locality as the 2 preceding species. 



