85 



LIST OF ILLUSTRATIONS. 



Page 



1. Amoeba radiosa, after Auerbach 4 



2. Various forms of Rhizopoda, after Ehrenberg and KoUiker 6 



3. Various forms of Foraminifera, after D'Orbigny, Parker, 



and Williamson 13 



4. Structure of Orbitolites complanatus, after Carpenter . 19 



5. Polycystina, after Ehrenberg 28 



6. Structure of Grara^ia,&c., after Dobie and Williamson . 31 



7. Structure of Tethya, after Huxley 38 



8. Structure of seed-like body of Spongilla, after Carter . 39 



9. Structure of Thalassicollidce, after Huxley 45 



10. Acanthometra lanceolata, after J ]\I tiller . . . .47 



11. Cr re^anw« and Psorosper?ni<E, after Kolliker and Kobin . 50 



12. Structure of Vorticella, &c., after Ehrenberg and Lachmann 55 



13. Various forms of Infusoria, after Dujardin and Ehrenberg . 60 

 14 Marine hifusoria, after Strethill Wright . . . .61 



15. Development of Vorticella microstoma, after Stein . . 70 



16. Noctiluca miliaris, after Quatrefages , .... 74 



