Note on the Biology of Fegatella conica. 245 
Fig. 1. Fegatella conica. 1, diagram showing typical thallus of Form I 
(see Text), nat. size ; 2, transverse section (diagrammatic) of thallus of Form 
I, x 20; 3, 4, 5, assimilating filaments of Forms I, II and III, respectively, 
x350 ; 6, 7, diagrams showing typical thalli of Forms IV and V respectively, 
nat. size; 8, transverse section (diagrammatic) of thallus without air chambers, 
x 50 ; 9, part of this thallus, x 80 ; 10, transverse section (diagrammatic) of 
thallus of transitional form, x 50; 11, assimilating filament of transitional 
form, x 350; 12, tuberculate rhizoids of Form I, x 350; 13, tuberculate rhizoids 
of transitional form showing reduction in tuberculation, x 350; 14, part of 
thallus of transitional form, x 80. 
Lettering: a., assimilating tissue; a. c., air chamber; a./., assimilating 
filament; b., basal portion of assimilating filament; cl., chloroplast; e., epi¬ 
dermis; m., midrib; m.s., mucilage sac; n., neck of assimilating filament; 
s., storage tissue; s.r., smooth rhizoids; st., starch grain; t.r., tuberculated 
rhizoid ; v.s., ventral scale. 
