Mesoxylon and an Allied Genus . 
21 
PLATE II. 
Photographs by Mr. W. Tams. 
Fig. io. From a higher section of the same shoot as Fig. 9, showing the enlarged stele and 
surrounding tissues. /., the large, solid pith ; l.t., a single leaf-trace passing through the wood, 
x about 15. S. 3019. 
Figs. n-14. Stem of Mesoxylopsis Arberae. 
Fig. 1 r. General transverse section. UP, single leaf-trace starting from the pith; UP, another 
leaf-trace ; c., remains of cortex, x about 7. S. 2983. 
Fig. 1 2. The leaf-trace, UP, from Fig. 1 1 and neighbouring tissues, more magnified. xP, centri- 
petal xylem of leaf-trace, x about 50. S. 2983. 
Fig. 13. General transverse section of another stem, showing rings of growth. p., more or less 
solid pith ; UP, l.t ?, single leaf-traces passing through wood, x about 4. S. 2993. 
Fig. 14. The leaf-trace, LtP , from Fig. 13 and neighbouring tissues more magnified ; xP, centri- 
petal xylem of leaf-trace, x *about 50. S. 2993. 
Figs. 15, 16. Mitrospermunt compressum. 
Fig. 15. Transverse section of seed, sa., sarcotesta ; sc., sclerotesta ; pr., prothallus, a delicate, 
imperfectly preserved tissue, filling the megaspore, x about 16. S. 2781. 
Fig. 16. Part of obliquely transverse section through upper part of a seed, sc., sclerotesta ; 
p.c ., the pollen-chamber, in which four large pollen-grains, p.g., are contained, x 125. S. 2787. 
PLATE III. 
Mesoxylon muliirame. 
From drawings by Mr. G. T. Gwilliam. All are from the section shown, as a whole, in Text- fig. 1. 
Fig. 17. The branch b of the fertile shoot, in approximately transverse section, st., stele of 
branch; br., a free bract; ap., appendage; br.s ., bract, apparently subtending the appendage, 
x about 30. S. 2781. 
Fig. 18. Part of stele of fertile shoot, transverse. xP, apparent primary wood; xP, secondary 
wood, x about 170. S. 2781. 
Fig. 19. Part of fertile shoot, at A end, transverse, si., portion of main stele; st.b., stele of 
a branch; v.b., distal bundle, x about 60. S. 2781. 
