io6 Hill.—The Structure and Development of 
EXPLANATION OF FIGURES IN PLATES 
VI AND VII. 
Illustrating Mr. Hill’s paper on Triglochin maritimum. 
Abbreviations :— antips., antipodal cells ; a. s., air-spaces of the medulla; a. j 1 ., 
air-spaces of the cortex ; a. s. /., air-spaces of the leaf; asm., assimilatory tissue; 
b. c., basal cell; camb ., cambium ; carp., carpel; c. c., central cavity; co., cortex ; 
comp, c., companion-cell; cot., cotyledon; cu. cuticle; d. n., definite nucleus; 
emb ., embryo ; end., endodermis; exod., exodermal-like thickening ; g., glandular 
body; g. c., guard-cell; l., leaf; l. b., leaf-base; osp., oospore; p., petal; ph., 
phloem; p. mer., primary meristem ; p. n., polar nucleus; pxy ., protoxylem; 
rt., root; s., sepal; s. a., stem apex; scl., sclerenchyma ; s. /., second leaf; s. pi., 
sieve-plate; s. t., sieve-tube; sta., stamen; syn., synergidae; th.par., thickened 
parenchyma ; v. b., vascular bundle ; xy., xylem. 
All the figures, excepting those relating to the flower-development, were out¬ 
lined by means of an Abbe Camera lucida, the details being drawn by freehand. 
The lenses used were made by Zeiss. 
Fig. i. Diagram of a transverse section of an old rhizome, x 45. 
Fig. 2. Transverse section of a rhizome, showing the vascular bundles, x 300. 
Fig. 3. Transverse section of a rhizome, showing the cambium and a young 
bundle, x 250. 
Fig. 4. Diagram of a transverse section of a peduncle, x 82. 
Fig. 5. Transverse section of a peduncle, showing a young vascular bundle with 
primary meristem. x 650. 
Fig. 6. Similar section, showing an older bundle with the .surrounding tissue 
lignified. x 360. 
Fig. 7. Transverse section of leaves; the sheathing base of the outermost one is 
shown ; somewhat diagrammatic. X 45. 
Fig. 8. Transverse section of a leaf, showing cortical structure, x 250. 
Fig. 9. Longitudinal section of a glandular body, x 160. 
Fig. 10. Similar section, showing the endodermoid markings at the base, 
x 360. 
Fig. 11. Similar section of an older gland, showing the basal cells thickened to 
a much greater extent, x 650. 
Fig. 12. Transverse section of a root, showing the exodermis and outer cortex, 
x 650. 
Fig. 13. Transverse section of a root, showing the general structure, x 320. 
Fig. 14. Longitudinal section of a root in the outer cortex of the rhizome, 
showing a sieve-tube and plates, x 680. 
Fig. 15. First primordium of the flower, (a) in surface view; ( b ) from the side. 
Fig. 16. Young flower, showing the first sepal and the second one just arising. 
Fig. 17. Similar preparation of a slightly older flower seen from the side. 
Fig. 18. A flower with all three sepals formed. 
Fig. 19. A similar preparation of an older flower, showing the first two petals. 
Fig. 20. An older flower with all the perianth-lobes complete. 
