THE AUSTRALIAN NATURALIST. 169 
EXPLANATION OF PLATES 
Macrozamia. PI. iii. 
Figure 1.—Female Cone (reduced). 
Figure 2.—Carpel with Ovules. 
Figure 3.—Longitudinal section of ovule—a. integument, b. micro- 
pyle, c. nucellus, d- Embryo sac, e. prothallium. 
Figure 4.—Stamen with pollen sacs, (a) microsporangia, (b) same 
enlarged, (c) microspores or pollen grains (b and c magnified) . 
Figure 5.—Part of seed removed, (a) cuter skin, (b) fleshy tis- 
sue, (c) nut, (neduced). , 
Figure 6.—Optical Section of Germinating Seed. (a) nut, (b) 
endosperm, (c) upper part of Cotyledon, (d) radicle, (e} 
aerating roots. 
Dawsonia. PI. iv. 
Figure 1.—Cross-Section of Stem, surrounded by imbricate leaves, 
(a) hydrome, (b) leptome, (c) cortex, (d) leaf trace. 
Figure 2.—Section of Leaf. (a) lamellae, (b) lamina. 
Figure 3.—Leaf. 
Figure 4.—Male Cluster.. (a) cluster. 
Figure 5.—Male organs. (a) antheridia, (b) paraphyses. 
Figure 6.—Female bud, 
Figure 7.—Female organ: (a) archegonium, (b) paraphyses. 
Figure 8.—Sporophyte. (a) seta, (b) capsule with calyptra, (c) 
sporophyte, (d) gametophyte. ; 
Figure 9.—Cross Section of Capsule. (a) wall, (b) space with 
trabeculae, (c) spore sac, (d) central space with trabeculae. 
Figure 10.—Calyptra (hairs removed). 
Figure 11.—Capsule with calyptra removed. (a) operculum, 
Figure 12.—Capsule showing (a). peristome. 
