54 G. o. SARS. M.-N. Kl. 



— 7. Adult male, seen from right side. X "^2. 



— 8, Antennula of same, more highly magnified. 



Ceriodophnia Rigaudi, Richard. 

 Fig. 9. Adult, oviferous female, seen from the dorsal face (rami of left 

 antennae omitted). X 104. 



— 10. Same, viewed from left side. 



— II. Head with the anterior part of the valves (antennae omitted), 



more highly magnified. 



— 12. Tail, seen from left side. 



— 13. Part of the shell, showing the reticulated sculpture, highly magnified. 



— 24. Adult male, seen from left side. X 104. 



— 15. Antennula of same, more highly magnified. 



PL III. 



Simocephsilus capensis, G. O. Sars. 



Fig. I. Adult, oviferous female, seen from left side. X 38. 



— 2. Same, viewed fiom the ventral face. 



— 3. Inferior part of head, with the lahrum, more highly magnified. 



— 4. Terminal part of tail, lateral view. 



— 5. One of the caudal claws, more highly magnified. 



— 6. Ephippium, seen from left side. 



— 7. Adult male, viewed from left side. X 104. 



PI. IV. 



Leydigia acanthocercoides, Fischer. 



Fig. I. Adult, oviferous female, seen from left side. X 80. 



— 2. Tail of same, more highly magnified; lateral view. 



— 3. Adult male, viewed from left side. X 104. 



— 4. Tail of same, lateral view. 



Alonopsis Co 11 ett i , G. O. Sars. 

 Fig. 5. Adult female, with winter-egg, seen from left side. X 68. 



— 6. Same, viewed from the ventral face. 



— 7. Tail of same, more highly magnified; lateral view. 



— 8. Adult male, seen from left side. X 68. 



Chydorus B arr ois i , (Richard). 

 Fig. 9. Adult, oviferous female, seen from left side. X 132. 

 • — 10. Same, viewed from the dorsal face. 



