Fic. 
1. Moina paradoxa. Abdomen of female from Minnesota. 
ar ee * Spine from post-abdomen. : 
2. * — rectirostris. Post-abdomen. bi) apa 
3. ‘* paradoxa. Head of female, showing: (a) eye with pigment _ Es 
and lenses, (b) supra-cesophageal ganglion, antennule | 
- with (c) its muscles, (d) itsnerve, and (e) its terminal yan 
sensory filaments, (f) the cecum of stomach, (Gi ee 
optic ganglion, (h) stomach, (7) cwsophagus, es the oS 
muscles which move the eye, also part of the jabea f 
4. **  paradoxa. Antenne. eee 
5. * — rectirostris. Ephippium. ets! eee 
6. “© paradoxa. Ephippium. ; roi eee 
v¢ at “ Seminal cell. | é : sant 
Ware st A group of seminal cells less magnified. 
&. * _ rectirostris. Seminal e¢ells. Ha 
9. *  paradoxa. First foot of male. Sarees 
10. *  yeetirostris. First foot of male. (From Weismann). 
Lk. $$ te Male. (From Weismann). 
12. Ceriodaphnia rotunda. Head. ; 
13. * punctata. i 
14. Mf pulchella. =“ Me 
15, cs reticulata. — ‘‘ ; 
16. ee quadrangula. ‘ 
17: ph “3 “¢ (Variety. ) 
18. st . Post-abdomen. | So eee 
19. é _pulchella. i ; Naan 
20. cs megops. Si ; Raa 
D1 ¢ reticulata. 2 ferns 
22. ‘ laticaudata. ig 
23. : rotunda. + ‘ie 
Figures 12-23 are after P. E. Mueller.) ee i 
Rs: 
Pe 
