RHODO-THIOBACTERIA 135 



Genus i. — Lankesteron (Ellis). 



Literature. — Lankester (i), 1873, and (2), 1876 ; Warming, 

 1876; Zopf (i), 1882, (2), 1885, and (3), 1895; 

 Winogradsky (i), 1887, and (2), 1888 ; Migula (i), 

 1887, and (5), 1904 ; Bergey, 1923 ; Bavendamm, 

 1924; Buchanan, 1925, and Ellis (11), 1929. 



A widely distributed genus, found in marine and fresh 

 waters containing plant and animal remains. Characteristics 

 as for the family Lankesteracece. 



Lankesteron rubescens (Lankester), Ellis. 



Syn. Bacterium rubescens (Lankester). For the description 

 of this species see page 137, Fig. 24. 



Lankesteron sulfuratum (Warming), Ellis. 



Syn. Bacterium sulfuratum (Warming). See page 138, 

 Fig. 25. Warming mentions Monas vinosa (Ehrenberg), 

 Monas erubescens (Ehrenberg), Monas Warmingii (Cohn), and 

 Rhabdomonas rosea (Cohn) as synonyms. 



Lankesteron roseo-persicina (Zopf), Ellis. 



Syn. Beggiatoa roseo-persicina [Zopi). There are numerous 

 phases in the life-history of this organism, and numerous 

 synonyms for these phases, as for example, Lamprocystis 

 roseo-persicina ; Protococcus roseo-persicina ; Pleurococcus roseo- 

 persicina ; Clathrocystis roseo-persicina ; Cohnia roseo-persicina ; 

 Thioroseo-persicina. 



A description of this organism is given on pages 140-141, 

 Fig. 26. 



Family 2. — Chromatace/E. 



Free, motile, cells, normally of a cyhndrical-elliptical 

 shape. One polar cilium. Reproduction by transverse 

 fission. 



Genus i. — Chromatium (Perty). 



Literature. — Ehrenberg (i), 1838 ; Weisse, 1845 ; Perty, 

 1852 ; Cohn (i), 1875 ; Warming, 1875 ; Zopf 

 (l), 1882 ; Winogradsky (i), 1887, and (2), 1888 ; 

 Engelmann (3), 1888 ; Butschli (i), 1890, and 

 (3), 1896; Zettnow (i), 1891, and (2), 1897; 



