Vll 



LIST OF ILLUSTRATIONS. 



PLATES. 



Portrait of the late B. T. Lewis, F.R.M.S., facing page 107. 



1. Phases in the formation of Sporangia of Stemonitis. 



2-6. Bdelloid Rotifera of South Africa. 



7. The Secondaries of Pinnulariae. 



8. Nitzschia singalensis. 



9. Typical Sporangia of Mycetozoa. 

 10-14. Bdelloid Botifera of South Africa. 



15. Development of Discorhabd in Latrunculia bocagei B. and D. 



16. Development of Discorhabd in Latrunculia apicalis B. and D. 



17. The Discorhabd of Latrunculia apicalis B. and D. 

 18-19. Desmid flora of Dartmoor. 



20. Dartia Harrisi gen. et sp. nov. 



21. Eylais Wilsoni sp. nov. 



22. Portrait of Alpheus Smith. 

 23,24. Schistostega osmundacea Mohr. 



25. Lebertia sefvei Walter. 



26. The " Monmouthiana Integral." 



27, 28. Variation in the Genera Navicula and Cymbella. 

 29, 30. Volvox Bousseletii et ajricanus G. S. West. 



FIGURES IN THE TEXT. 



Page 53. Mastax of Monoceros falcatus sp. nov. 



,, 85. A simple trough for pond-life. 



,, 118. Beduced outline of the "crab-like insect" of Hooke, pi. 



xxxiii. fig. 2 [= Cheiridium museorum (Leach)]. 



,, 119. Cheridium museormn (Leach), from Kew, pi. v., fig. 13, 



,, 140. Conventional figures of sporangia of Mj^^cetozoa. 



,, 144. Phases in development of sporangia of Comatricha nigra. 



,, 227. Apparatus used for collecting, etc., bdelloid Botifera. 



,, 229; Apparatus used for collecting, etc., bdelloid Botifera. 



,, 301. Diagram : Measurement of magnifying powers. 



,, 303. " The Shepherd's Hut," 



,, 368. Photo- synthetic system of light.cells (after Noll). 



,, 371. Diagram of light rays in obconical cell (after Noll). 



,, 438. Oil-immersion dark-ground illuminator. 



