1921.} The Kighth Indian Science Congress. clxv 
found in India only in one species, and has been named Buck- 
landia indica (Seward 1917, p. 488); leaves of the Ptilophyllum 
type have been seen in organic connection with it; they left 
persistent rhomboid cushions on the stem as in the living 
genus Oycas. But it is noteworthy that the secondary wood 
was compact, the medullary rays being uniseriate (Bancroft 
1913) 
It may safely be asserted that some of the Indian Walliam- 
sonia flowers belong to plants having leaves of the Ptilophyl- 
lum acutifolium type. But as to the organisation of the flowers 
there is no conclusive evidence : there is a difference of opinion 
even on such a fundamental point as the unisexual or bisexual 
“nity so far available’? (Seward 1917, p. 511). Unfortunately. 
apart from Ptilophyllum, of which the cuticular structure was 
quite recently described (Seward and Sahni i920, pp. 21- 
23) none of the Indian specimens of Cyecadophytan fronds have 
yielded cuticular preparations. 
As for the coniferous remains of the Indian Jurassic beds, 
tly, 
angular cone-scales, each produced distally into a long and 
narrow tapering process and bearing a single embedded ovule. 
flora, in which there are a number 0 species referable to 
the Marattiaceae, Gleicheniaceae, Osmundaceae and Cyathea- 
ceae. Practically all the Rajmahal ferns are confined to this 
“Stage. 
The great scarcity petrified plants from the Jurassic rocks 
of India is disappointing, for in rocks of the same age in Queens- 
land abundant petrified coniferous woods and ferns have been 
discovered (Sahni 1920). 
VII. Cretaceous. 
With the Umia stage we pass into the highest beds of the 
: Gondwana period. Plan ave been dis- 
— covered, so far as I know, only in the upper- 
