Fig. 



J. Pleuroxus hamatus. Post-abdomen and antenna. 



2. " afflnis. 



3. Alona costata. 



4. Leydigia quadraiiguliiris. 



Eurycercus lauiellatus. 



5. Male. 



5a. Posterior margin. 



6. Antenna of female. 



7. Alonella pygmaia. 



Euryteniora afflnis Poppe. 



8. Female. 



9. Female abdomen. 



10. Male. 



11. Male abdomen. 



12. Fifth feet of male. 



13. Fifth feet of female. 



14. Jaw. 



15. Antennule. 



16. Jf auplius larva of this or a related species. 



