Scott and Mas ten. — The S true hire of Trigonocarpus . 115 
Miss Stopes’ figure, we see in Trigonocarpus two, or possibly three, bundles, 
b ., b. y b., enclosed in a space bounded by cells of the sarcotesta, some 
of which, a ., show fine spiral markings, and perhaps indicate a sheath some- 
what similar to that of Cycas Beddomii. In the fine tissue around and 
between the bundles are seen abundant fine transfusion elements or short 
tracheides, s.t., very similar to those of this species of Cycas. It would thus 
appear that the sarcotestal bundles of Trigonocarpus Parkinsoni , at least in 
the lower part of the seed, were of a complex type. 
Leaving the general structure of the bundle we may next consider 
some points of detail. In PL XIV, Fig. 25, one of the bundles (the upper 
one) is traversed for a distance in a longitudinal direction, while the other 
(below) is cut more obliquely. The upper bundle affords evidence of being 
mesarch in structure, as the elements with more diffuse thickening bands 
occupy a more or less central position. It thus confirms the conclusion 
arrived at from the transverse sections (p. 104). The commonest type 
of tracheide in the bundle is apparently thickened in a very fine spiral, 
whilst others show loose or compact reticulate markings. Some of the 
tracheides are shown more highly magnified in PI. XIV, Fig. 26. The 
commonest type is that shown at A with exceedingly fine spiral or scalariform 
markings. A distinctly scalariform tracheide is shown at D with the same 
exceedingly delicate thickenings. As supporting the probable connexion of 
Trigonocarpus with Medullosa it is interesting to note the similarity of these 
tracheides of Trigonocarpus with the fine scalariform elements characteristic 
of the primary tracheides of Medidlosa anglica L PL XIV, Fig. 26, B, shows 
one of the tracheides from the central part of a bundle, perhaps one of the 
elements of the protoxyiem, while C shows a common type in which two 
crossing series of spiral bands are present. Similar tracheides to the latter 
are common in Medidlosa anglica } and, as the two series of thickenings are 
not quite equally in focus at the same time, they probably represent the 
markings of two adjacent tracheides on the common wall between. 
PL XIV, Fig. 27, shows two of the short tracheides or transfusion 
elements of PL XIV, Fig. 25, s.t . Like the most typical tracheides of the 
bundles their markings are of a particularly fine character. 
The Micropylar End of the Seed. The Question of a Wing. 
A remarkable feature of this seed is the great prolongation of the 
micropylar tube, which in some specimens considerably exceeds the body of 
the seed in length. In the specimens figured in this paper, PL XII, Figs. 16 
and 17, and PL XIII, Fig. 18, the micropyle is only slightly longer than the 
body of the seed, but it is possible, and indeed probable, that the full length 
of the beak is not preserved, although Fig. 17 has the appearance of being 
complete. A specimen of Trigonocarpus Parkinsoni in Mr. Kidston’s 
1 Scott (’ 99 ), pp. 89, 95 ; PI. 10, Fig. 5 ; PL 12, Fig. 15. 
