EXPLANATION OF PLATE II. 



Fig. 1. Daphnella exspinosa, fern. Antennule X 140. 



2. " " male. 



3. " " " Post-abdomen X 140. 



5. Daphnia lsevis, fern. " " 



6 a, a. " " " Embryo, outline of head. 



6 b, b'. " " " Young, 



6 c. " " " Adult, 



7. " " male. Antennule X 140. 



8. Ceriodaphnia cristata, fern. Head X 130. 



9. " " " Post-abdomen X 130. 



10. Bosmina cornuta, fern. Head, etc., X 150. 



11. Pleuroxus straminius, fern. Post-abdomen X 140. 



12. " insculptus, " Details of marking. 



13. " hamatus, " " " 



14. " " " First foot X 148. 



15. " acutirostris " X 135. 



16. Alona angulata, fern. X 135. 



17. " tuberculata, fern. X 135. 



18. " " male. Post-abdomen X 140. 



19. Chydorus sphsericus, male. X 150. 



