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the Sporophylls of the Cycadaceae. 
portion of a young sporophyll in which the parts of the 
bundle are not as yet fully developed, the xylem consists 
of protoxylem, on the ventral side of which are two or three 
elements of centripetal, and occasionally, on the dorsal side, 
one or two elements of primary centrifugal xylem, and in 
the lateral region are primary elements intermediate between 
the two kinds. In one or two bundles one tracheide was 
seen which appears to be secondary in origin, and which was 
deeper in colour and larger than the others, and isolated, 
lying quite apart from the group of primary tracheides. 
Female Sporophyll. Two bundles arise independently from 
a distinct strand of the central cylinder of the axis of the 
female cone ; on their way outward through the cortex they 
each divide up into a number of bundles, some of which pass 
up on to the ventral side of the others, turning on their axes 
as they do so, so that in the stalk of the sporophyll there 
is a ring or double row of bundles with their xylems all 
pointing towards the centre. The ventral bundles of the 
stalk with inverted orientation nearly all, in the lamina, turn 
on their axes and become normally orientated, so that two 
rows of bundles pass upwards through this region ; one or 
two bundles, however, lying somewhat out of the ventral row, 
towards its inner side, retain their inverted orientation. As 
the sporophyll was very young, the bundles had not yet 
attained their full development ; but in the stalk, centrifugal 
and no centripetal xylem was developed. 
C. MlQUELIANA, H. Wendl. 
Female Sporophyll. In the lowest part of the stalk there is 
a row of three or four bundles, of which the two outer lateral 
ones are of great size, with a very well-developed mass of 
centrifugal and two or three quite small elements of centri- 
petal xylem. The one or two intermediate bundles are quite 
small, elongated radially, and may have an element or two of 
centripetal xylem. In some sporophylls there occur on the 
ventral side of and lying usually some distance away from 
R 2 
