Fig. 

 1. 



la. 



2. 



3. 



4. 



5. 

 6. 

 7. 

 7a. 



s. 



9. 

 10 

 11. 

 12. 



13. 

 14. 

 15. 

 16. 



17. 

 18. 

 19. 

 20. 

 21. 

 22. 

 23. 



Moina paradoxa. Abdomen of female from MinDesota. 

 '• '• Spine from post-abdomen, 



" rectirostris. Post-abdomen. 



" paradoxa. Head of female, showing: (a) eye with pigment 

 and lenses, (b) supra- oesophageal ganglion, antennule 

 with (c) its muscles, (tZ) its nerve, and (e)its terminal 

 sensory filaments, (/) the ctecum of stomach, ([/) 

 optic ganglion, (/?) stomach, (^) oesophagus, (j) the 

 muscles which move the eye, also part o( the labrum. 

 paradoxa. Autenute. 

 rectirostris. Ephippium. 

 paradoxa. Ephippium. 

 " Seminal cell, 



*' A group of seminal cells less magnified. 



rectirostris. Seminal cells, 

 paradoxa. First foot of male, 



rectirostris. First foot of male. (From Weismann). 

 " Male, (From Weismann), 



Ceriodapliiiia rotunda, 

 punctala. 



Head. 



pulchella. '• 



reticulata. '' 



quadraugula. " 



" " (Variety.) 



" Post-abdomen, 



pulchella. " 



megops. " 



reticulata. " 



laticaudata. " 



rotunda. " 



Figures 12-23 are after P. E, Mueller,) 



