30 : DEVELOPMENT OF THE FLOWER 
wise they are thickest, with a very large central vascular 
fasciculus containing ducts and spiral vessels ; these last 
perhaps exist only towards the base, as they are here only 
freely unrollable ; the tegument consists of 3 layers, the in- 
ner of which is cellular and very lax, the cells being disposed 
transversely. The inner layer is with difficulty separable, 
and like the outer very fine. Occasionally there is a cleft ex- 
tending along the dorsum of the seed, but it does not 
penetrate the inner portion of the tegument. Both the 
apex and base of the nucleary membrane are subsequently 
ree. 
Plate 62, Fig. If. Fruit of Roxburghia. 
1. Seed. 
2. Ditto, long section. 
3. Albumen separated, with its basilar cavity. 
4, 5. Embryo. 
6. Ditto, long section shewing the sub-exsertion of the 
apex of the plumule. 
Professor Lindley's description and figure, Wall. pl. Asiat. 
Rarior. Vol. 3, tab. 282, p. 49, is correct excepting the 
* funiculus apex arilliferus,” and ‘ plumula rima nulla." 
Hence, according to this distinguished author, it differs 
chiefly from Aroidez in its highly developed perianthium. 
June llth, 1835. Calcutta, H. B. C 
From the enclosed observations, as represented in the 
sketches, it follows that Roxburghia is unicarpellary, and 
hence more Aroideous than Dioscoreous. 
That the placenta is not marginal, and not central, but 
forms an elevated margin parallel to the convolution of the 
base of the carpel leaf. "That nevertheless it is double, to 
whatever it be referred. 
That the carpel leaf is a convex body, open near the centre; 
that the ventral suture by the production of which it becomes 
a convolute leaf, is a subsequent extension downwards of 
one margin of the opening. 
That it is unicarpellary, not only from development, but 
from obliquity of the stigma. 
