Life-history of Anaboena Cycadeae . 
379 
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explanation of figures in PLATE XXXII. 
Illustrating Miss Spr alt’s paper on Anabaena Cycadeae. 
Fig. 1. Nodules of Cycas. Natural size. 
Fig. 2. Portion of transverse section of nodule, showing algal zone ; c., cork ; o.c., outer 
cortex ; A.Z., algal zone ; i.c., inner cortex, x 500. 
Figs. 3-26 are magnified 2,200 times; m.s. denotes mucilaginous sheath; o.i., outer invest- 
ment; i.i., inner investment; t.s., transverse septum; H., heterocyst; yg.H ., young heterocyst; 
C.B . , central body; g ., granules; c.g., cyanophycin granules; v.c., vegetative cell ; T.H., terminal 
heterocyst; I.H., intercalary heterocyst; ex., exospore; en., endospore; /., papilla; m., mucilage ; 
sfi.c. , spore contents ; sp.w., spore wall. 
Fig. 3. Vegetative filament of Anabaena, showing the cellular investments. 
Fig. 4. Very young vegetative filament. 
Fig. 5. Vegetative cell, showing the central body with a semblance of a nucleolus and nuclear 
membrane. 
Fig. 6. Typical vegetative cell, showing central body. 
Fig. 7. Vegetative filament, showing several different stages in the central body. 
Fig. 8. Vegetative filament, showing the cyanophycin granules. 
