viii CONTENTS 



CHAPTER VT. 



PAGE 



The Leuco-thiobacteria (Colourless Sulphur Bacteria) . . 92 



BeggiatoacecB : Beggiatoa ; Beggiatoa alba, sheath formation, growth, 

 autolysis, methods of reproduction ; other species of Beggiatoa ; 

 pleomorphism of Beggiatoa ; Beggiatoa niirabilis ; Beggiatoa 

 arachnoidea ; Beggiatoa leptomitifovmis. Thiothrix ; Thiothrix 

 nivea / Thiothrix tenuis and tenuissima ; Thiothrix annulata ; 

 Thiothrix marina ; Thiothrix violacea. Thioploca ; Thioploca 

 Schmidlei ; Thioploca ingrica ; Thioploca minima and mixta. 



CHAPTER VH. 



The Leuco-thiobacteria (continued) . . . . . .116 



Achromatiacecs : Achromatium ; Achromatium oxaliferum [Modderula 

 Hartwigi and Hillhousia niirabilis), cell contents, growth, 

 reproduction, and habitat. Achromatium mobile; Microspira 

 vacillans. Thiophysa ; Thiophysa volutans ; Thiophysa 

 macrophysa. Thiosphcsrella amylifera. Thiovulum Miilleri. 

 Thiospirillacecs : Thiospirillum Winogradskii ; Thiospirillum 

 grannlatum ; Thiospirillum bipnnctatum ; Thiospirillum 

 agilissimum ; Thiospirillum agilis ; Thiospirillum elongata. 

 ThiobacillacecD : Thiobacillits Bovistus ; Thiobacillus thiogenus. 

 Thiopseudomonas ; Pseudomonas bipunctata and hyalina. 



CHAPTER VIII. 

 Rhodo-thiobacteria (Coloured Sulphur Bacteria) . . -134 



Lankesteracsce : Lankesteron ; Lankesteron rubescens ; Lankesteron 

 sulfuratum ; Lankesteron roseo-persicina. ChromatacecB : 

 Chromatium ; Chromatium Okenii ; variant forms of Chr. 

 Okenii (Chr. Weissii, Chr. minus, Chr. minutissimum, Chr. 

 gracile) ; Chromatium Warmingii ; Chromatium Linsbaueri ; 

 Chromatium violascens ; Chromatium cuculliferum; Rhabdomonas 

 and Rhabdochromatium ; Rhabdochromatium roseum, minus, 

 and gracile ; Rhabdochromatium Linsbaueri. Thioporphyra 

 volutans, reproduction, bud formation, regional rejuvenescence, 

 ciliation and movement. 



CHAPTER IX. 

 Rhodo-thiobacteria (continued) ...... 160 



Rhodothiospirillacece : the terms Thiospirillum, Rhodothiospirillum, 

 and Ophidomonas ; Rhodothiospirillum jenense. Rhodocapsacea : 

 Rhodocapsa suspensa ; Rhodothece pendens ; Rhodothiosarcina 

 rosea. ThiocapsacecB : the terms Micrococcus, Streptococcus, 

 Sarcina ; Thiocapsa roseo-persicina ; Thiocystis violacea ; Thio- 

 cystis rufa ; Thiosphcerion violacea ; Thiosphcera gelatinosa. 

 Amoebobacteriacecs Amasbobacter : roseiis, bacillosus, granula ; 

 Thiodictyon elegans ; the terms Thiothece and Thiopoly coccus 

 Thiothece gelatinosa and Thiopoly coccus ruber. Thiopediacecs 

 Thiopedia rosea. Lamprocystis roseo-persicina, violacea, gela- 

 tinosa, rubra, and rosea. 



