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 the capsules which are found in surface films. No motility observed. Aerobic. Comment: The differences between the two species placed by Naumann (loc. cit.) in the genus Sideroderma are not very sig- nificant. Moreover, as surface-film organ- isms, these are so much like F errihacterium duplex Brussoff that they clearly belong in the same genus. Source: Found in the Anebodae region of Sweden. Habitat : Found in fresh water, in swampy ditches and in small streams.

Si.de.ro.mo'nas. Gr. noun siderus iron; Gr. noun monas a unit, monad; M.L. fem.n. Sideromonas iron monad.

Short, coccoid to rod-shaped cells each embedded in a rather large, sharply outlined capsule. The number of cells may increase within the capsule, and older capsules may unite to form larger colonies, the outlines of which are ill-defined. The capsules are impregnated with iron or manganese compounds or are completely encrusted with them.

The type species is Sideromonas confervarum Cholodny.

1. Sideromonas confervarum Cho- lodny, 1922. (Cholodnyi (sic), Ber. d. deutsch. Bot. Ges., 40, 1922, 326; also see Cholodny, Die Eisenbakterien, Pflanzen- forschung, Heft 4, Jena, 1926, 55.) con.fer.va'rum. M.L. fem.n. Conferva a genus of algae; M.L. gen. pi. noun confer- varum of confer vae Coccobacteria, 0.5 to 0.6 by 0.8 to 1.0 micron, occurring in chains embedded in gelatinous masses 10 to 100 microns in diameter. Chains become visible when the gelatinous mass is treated with formalin followed by dilute HCl, washed in water and stained with gentian violet or carbol- fuchsin. No motility observed. Form deposits of iron salts within the gelatinous mass surrounding the chains. Probably facultative autotrophic (Dorff, Tabulae Biologicae, 16, 1933, 222). Cause the algal cells that are surrounded bj^ the zoogloeal masses to become darker green than normal. Source: Found on the surface of algae {Conferva) in water containing iron salts near Kiew (Ukraine); also found near Berlin, Central and Southern Sweden, Hungary and Moravia. Habitat: Widely distributed on fresh- water green

2. Sideromonas duplex (Naumann, 1922) Beger, comb. nov. {Siderocystis duplex Naumann, Kungl. Svenska Vetenskap- sakad. Handl., 62, No. 4, 1922, 43.) du'plex. L. adj. duplex two-fold, double. Slender rods with rounded ends, 0.5 by 1.5 to 3.0 microns, occurring singly or in pairs. Embedded in capsules that may fuse to form zoogloeal masses. Iron compounds impregnate the capsular material. No motility observed. Comment: The differences between this species and Ferribacterium duplex Brussoff are slight; cultural studies may show these two to be identical. Source: Found in the Aneboda region of Sweden. Habitat: Found on submerged objects in swampy ditches and small streams.

3. Sideromonas vulgaris (Naumann, 1922) Beger, comb. nov. {Siderocystis vulgaris Naumann, Kungl. Svenska Vetenskapsa- kad. Handl., 62, No. 4, 1922, 42.) vul.ga'ris. L. adj. vulgaris common.