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1907-8.] Five New Species of Iron -Bacteria. 
same relation to Leptothrix ochracea as do Gallionelia ferruginea and 
Spirophyllum, viz., that whereas in most places Leptothrix ochracea is 
overwhelmingly predominant, in one or two places the supremacy is 
gained by this organism. I have found it in Lanarkshire, Renfrewshire, 
Clackmannanshire, Perthshire, Dumbartonshire, Ayrshire, and Peebles- 
shire, in small quantities. It is the predominant organism in some 
iron-water near Kingswell in Ayrshire. It seems to be absent from the 
extreme northern counties of Scotland, and I have not yet been able 
to identify it in the English iron-waters. I am in possession of the 
complete life-history of this organism, which will form the subject of a 
later publication. 
2. Nodofolium ferruginenm (Ellis). — The second new species is in 
shape quite unlike anything hitherto known, and demands the creation of a 
new genus for its insertion. I propose to call the genus Nodofolium, and 
this species Nodofolium ferruginenm. Its general appearance may be 
described as that of a flat band, in which constrictions at regular intervals 
Fig. 2 . — Notofolium ferrugineum (diagrammatic). 
are to be found. The band between two such constrictions is in appearance 
like a stretched string sounding its fundamental note. The constrictions 
are further emphasised by the fact that at these places the individual is 
slightly humped up so that an arch is formed. An example is shown in 
fig. 2a. 
This species was found in samples derived from the central and western 
parts of Scotland, but seems to be wanting in the iron-waters of the 
north of Scotland, and also in those south of the Border. These state- 
ments cannot, however, be accepted as final until a more extensive examina- 
tion has been made. With regard to the size of these organisms, we find all 
gradations. Thus in fig. 2b we see one about 10/x, long, consisting of two 
loops. A band of this length is 1-1 \fx at its broadest and about f/x at 
its narrowest part; other examples may have as many as twelve loops, 
each about 10-1 2/jl long, and doubtless some individuals are still longer 
even than this. 
Its method of reproduction consists in the formation of a large number 
of conidia, which are formed in the same way as those of Leptothrix 
