of the Fishery Board for Scotland, 



191 



DESCRIPTION OF PLATE V. 



Fig. 1. Daphnia longispina, 0. F. Miiller, lateral view, x 29 



Fig. 2. Alona costata, G. O. Sars, lateral view, x 63 



Fig. 3. Alona quadrangularis (Miiller), lateral view, x 63 



Fig. 4. Alona neglecta, n. sp., lateral view, x 126 



Fig. 5. Alona rustica, n. sp., lateral view, x 126 



Fig. 6. Alona guttata, G. O. Sars, lateral view, x 63 



Fig. 7. Chydorus barbatus (G. S. Brady), lateral view, x 126 



Fig. 8. Chydorus barbatus (another form), lateral view, x 63 



Fig. 9. Chydorus sphaericus (Miiller), lateral view, x 126 



Fig. 10. Chydorus (?) ovalis, Kurz, lateral view, x 133 



Fig. 11. Alona quadrangularis (Miiller), lateral view, male, x 31 



Fig. 12. Alona costata, G. 0. Sars, post-abdomen, x 100 



Fig. 13. Alona quadrangularis (Miiller), post-abdomen, female, x 100 



Fig. 14. Alonella exigua, G. O. Sars, post-abdomen, x 400 



Fig. 15. Alona quadrangularis (Miiller), post-abdomen, male, x 200 



Fig. 16. Alona guttata, G. O. Sars, post-abdomen, x 400 



Fig. 17. Alona rustica, n. sp., post-abdomen, x 400 



Fig. 18. Alona neglecta, n. sp., post-abdomen, x 100 



Fig. 19. Chydorus barbatus (G. S. Brady), post-abdomen (see fig. 8), x 100 



Fig. 20. Alonopsis elongatus, G. O. Sars, post-abdomen, x 200 



Fig. 21. Chydorus barbatus (G. S. Brady), post-abdomen (see fig. 7), x 100 



Fig. 22. Chydorus sphszricus (Miiller), post-abdomen, x 100 



Fig. 23. Chydorus (?) ovalis, Kurz, post-abdomen, x 400 



Fig. 24. Alonopsis elongatus, G. O. Sars, foot of first pair — male, x 266 



Fig. 25. Alona quadrangularis (Miiller), foot of first pair — male, x 266 



