LIST OP ILLUSTBATIONS 



FIG. PAGE 



1. POLYCYSTINA FROM BARBADOS . ,' Frontispiece 



2. TONGUE OF EHYNGIA , . . Title-page 



3. DIATOM, HELIOPELTA METII . . 7 



4. PART OF A DIATOM, COSCINODISCUS BI-ANGULATUS 10 



5. DIATOM, FROM BORI, HUNGARY. . . 17 



6. DIATOM, ACTINOCYCLUS EALFSII . . .32 



7. FOCUSSING THE OBJECT IN THE MICROSCOPE . 37 



8. FOCUSSING ON THE CAMERA SCREEN . . 37 



9. POLYCYSTINA FROM BARBADOS ... 44 



10. FORAMINIFERA . . . . .52 



11. EADULA OF WHELK .... 56 



12. EADULA OF WHELK . . . .57 



13. EADULA OF LIMPET .... 61 



14. CIRRI OF BARNACLE . . . .65 



15. ECHINUS SPINE SECTION ... 68 



16. PROBOSCIS OF BLOW-FLY . . . .71 



17. PART OF FLY'S PROBOSCIS ... 74 



18. EGGS OF HOUSE-FLY . . . .77 



19. BUTTERFLY'S TONGUE . ... 80 



20. PORTION OF BEETLE'S EYE. . . .81 



21. FOOT OF WATER BEETLE (DYTISCUS MARGINALIS) 83 



22. TONGUE OF HONEY BEE . . . .86 



23. PART OF HONEY BEE'S HIND LEG . . 88 



24. GNAT (CULEX PIPIENS) . . . .89 



25. MOSQUITO (ANOPHELES MACULIPENNIS) . . 91 



26. LARVA OF ANT-LION. . . . .94 



27. EHYNGIA. 96 



28. HEAD OF CRANE FLY . . . .99 



29. ANTENNA OF COCKCHAFER (MELOLONTHA) . 101 



30. DIATOM, NAVICULA LYRA .... 103 



31. DIATOM, TRICERATIUM FAVUS . r r 106 



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