PL A TE XI. 



EXPLANATION. 



Figs. 1-19, ILLUSTRATING DEPOSIT AND DEVELOPMENT OF INFUSORIAL GERMS ON 



HAY-FIBRE, AS DESCRIBED AT CHAPTER IV. PAGE 136 et sea. 

 FIG. 



1. Fragment of hay-fibre examined after six hours' maceration, showing at a a 



encysted Vorticellce, and at b b b masses of microspores of Heteromita lens, 

 x 800. 



2. Fragment of hay-fibre, wetted and immediately examined ; at a a a, microspores 



of Heteromita lens ; at b, four macrospores of Oikomonas mutabilis ; at c, 

 macrospores of Heteronema caudata; and at d, macrospores of an unde- 

 termined type, x 800. 



3. Fragment of hay-fibre, showing at a a mass of microspores of Heteromita lens 



lodged in crevice formed by the serration of its surface, x 800. 



4. Fragment of hay-fibre encrusted with spore -masses of the single type Heteromita 



lens. 



5. Fragment of hay-fibre examined after two weeks' maceration, showing bacterial 



film and monad spores depending in grape-like clusters from its lower surface. 

 Minute monads developed from these spores, mixed with vibrios and Bacteria, 

 swimming beneath, x 8000. 



6-17. HETEROMITA LENS, Mull. sp. 6, 7, Two isolated patches of microspores, x 800 ; 

 8, 9, free-swimming monadiform germs developed from the patches of 

 microspores, x 800; 12-15, similar monadiform germs in their primarily 

 attached and variously aggregated free-swimming states, as seen with a 

 i-Vinch objective, x 2500; 16 and 17, succeeding biflagellate condition of 

 the same germs, x 800. 



1 8. HETERONEMA CAUDATA, Duj. sp., developed from the mass of the macrospores 



delineated at Fig. 2 c, x 800. 



19. HETEROMITA LENS. Adult monad, x 800. 



Figs. 20-46, ILLUSTRATING THE PROTOZOIC NATURE OF THE MYXOMYCETES OR 

 MYCETOZOA, AS DISCUSSED AT CHAPTER II. PAGE 41 et seq. (Fics. 32-35 AND 



45-47 AFTER ClENKOWSKI, THE REMAINDER AFTER A. DE BARY). 



20. ARCYRIA INCARNATA, Pers. Two sporocysts or sporangia ; the one at a burst 



and protruding its sporiferous rete or capillitium, x 15. 



21. PHYSARUM PLUMBEUM, Fries. Numerous associated sporangia, slightly 



enlarged. 



