504 
Proceedings of the Royal Society of Edinburgh. [Sess. 
which will, I think, convince all who are familiar with Gallionella, and have 
no preconceived opinions on the subject, of the generic value of the organism 
which I have named Spirophyllum ferrugineum. 
EXPLANATION OF FIGURES. 
Fig. 1. Diagrammatic representation of Spirophyllum ferrugineum. 
Fig. 2. Diagrammatic representation of Gallionella ferruginea. 
Fig. 3. Photomicrograph of Spirophyllum ferrugineum. At x two individuals 
in a stage of disintegration are shown, giving a superficial resemblance to 
Gallionella. Note, however, that in all cases the square-cut ends character- 
istic of this species are well shown. 
Fig. 4. Photomicrograph of Spirophyllum ferrugineum : some of the individuals are 
in a state of incipient conidia-formation. 
Fig. 5. Central figure is composed of two intertwining hands of Spirophyllum 
ferrugineum. 
Fig. 6. Central figure is composed of two intertwining bands of Spirophyllum 
ferrugineum , both of which are in a stage of incipient conidia-formation. The 
individual to right of central figure is covered with conidia, so that its outline 
has become somewhat vague. 
(Issued separately July 7 , 1911 .) 
