P(atcs l-^yi 'Tvxissh^ 

 388 Heterogenetic Developmerit in Diaptomus. [April, 



Fig. 3. Diaptomus castor (/*) fifth legs of adult female. 



" 4. " fifth legs of male of exaggerated or giganteus form 



(immature). 



" 5. " fifth legs of female. 



** 6. " caudal stylets of same. 



" 7. " margin of last thoracic segment of same. 



" 8. " leg of immature specimen of ordinary form just prior 



to molt. 



*' 9. " antenna of male, ^z^a;z/<?Mj form (immature). 



" 9<ji. " antennce of male, castor adult. 



" ()b. ' ** antenna of male, castor, older form. 



" 10. Epischurajlnviatilis, sp. nov., abdomen and fi.'th feet of male.' 

 "II. •' right foot of male. 



" 12. " right foot of female. 



" 13. " right foot of female (young). 



" 14. " mandible. 



*♦ 15. " labrum, mandibles and palpi. 



*• 16. '* end of maxilliped. 



•* 17. " globular upper part of testis. 



*' 18. " end of antennules. 



" 19, ** antenna of male. 



" 20. " swimming foot. 



" 21. Cyclops modestusy sp. nov., fifth foot. 



" 22. " stylets. 



" 23. ** end of antenna. 



" 24. Cyclops tenitissi7?tus, sp. nov., fifth foot. 



•* 25. '* terminal joint of antenna. 



" 26. Schapholeberis angulata, sp. nov. {a), antenna. 



" 27. ** first foot. 



«* 28. " lower angle of shell. 



•* 29. Shyiocephalus vetuhis, outline of posterior portion of shell in old females {a) 



spines. 



** 30. Sitnocephalus daphnoides. 



" 31. " lower angle of shell. 



EXPLANATION OF PLATE VL 

 Fig. I. Daphnia longispina, 



" 3- 



(( 



" 4. 



<( 



" 5- 



Daphnia dnbia. 



" 6. 



(( 



" 7- 



<( 



9. 



10. Daphnia longispina. 



11. Ceriodaphnia alabainensis, sp. nov., end of postabdomen. 



12. ** head. 



\ia. " reticulations of shell. 



13. Daphnia dubia, 



14. " 



