'124, Marsh — Cycloyidce and Calanidm of Wisconsin . 



16. Cyclops parens — fifth foot x 300. 



17. leuckarti from Heart Lake — second joint 



of outer maxilliped x 163. 



18. " pulchellus— fifth foot x 300. 



19. abdomen of female x 163. 



PLATE V. 



Fig. 1. Cyclops parens — -fourth foot x 163. 



2. ' leuckarti— Mth foot x 300. 



3. last antennal joint of female x 300. 



4. irom Lake Gussie — -outer maxil- 



liped x 300. 



5. abdomen of female x 58. 



6. littoral variety — fourth foot x 163, 



7. signatus — fourth foot x 163. 



8. " " fifth foot x 300. 



9. last antennal joint of female x 300. 



10. modestus — fourth foot x 195. t 



11. furca x 163. 



12. " " fifth foot x 360. 



13. outer terminal joint of third foot 



x 300. 



14. fluviatilis — fifth foot x 360. 



15. " " fourth foot x 300. 



PLATE VI. 



Fig. 1. Cyclops fluviatilis — abdomen of female x 300. 



2. serrulatus — abdomen of female, extreme pelagic- 



form, x 75. 



3. abdomen of female r intermediate 



form, x 100. 



4. " abdomen of female, littoral form, 



x 178. 



5. fourth foot x 178. 



6. phaleratus — abdomen of female x 92. 



7. second antenna x 300. 



8. flmbriatus — fourth foot x 300. 



9. " " furca x 300. 



