412 MISS T. L. PRANKERD ON THE STRUCTURE OF 
They are especially well shown at the base of the seed, and are also found in 
connection with the bundles *. 
Gv.) The Fluted Lining of the Сапору. = There is little to add to the general 
description already given of this structure, since histologically it is similar 
in most respects to the outer shell, though seldom so well preserved. Like the 
former it is composed of two layers—the fibrous, abutting directly on the 
parenchyma, and the innermost layer of the whole structure, which lines the 
sinus surrounding the lagenostome. The fibrous laver is here only one to 
two rows deep, and seems, so far as can be made out, in all respects similar 
to the corresponding layer of the outer shell, with which it is continuous at 
the eusps in its upper part—dying out in the same way just below the apex. 
The innermost layer is a directly infolded continuation of the epidermis of 
the seed, with which it seems to agree in all particulars, even to the 
papillate nature of the free, inwardly directed walls of the cells near the 
apex. 
B. The Vaseular System. 
It is to be regretted that we have no transverse section across the chalazal 
region, but, from analogy with 4. Гота, supported by the fact that по 
section of L. ovoides ever shows more than one bundle at the base, it is prac- 
tically certain that a single bundle entered the seed at the central papilla, 
though such details as the position of the protoxylem, whether the wood was: 
solid strand or not, ete., are necessarily lacking. 
The main bundle almost immediately divided up into a number of strands 
(usually 8), which ran in the soft tissue opposite the external ribs, one 
entering each loculus of the canopy. 
The main strand was composed of tracheids, and was apparently surrounded 
by a little parenchyma, but it is impossible to trace any true phloem. 
Around the branch strands at their base is a considerable amount of sclerotic 
tissues, and a definite tracheal plate, though not so pronounced as in 
L. Тотай, is thus formed at the base of the nucellus (cf. A, р. 464, and 
fig. 10). In transverse section the vascular strands are lenticular in outline 
(РІ. 24. fig. 28), measuring on an average 125 u long by 40 р broad, and 
thus seem to occupy а midway position in size between Physostoma and 
L. Готаей, the measurements for which are given as 50 x 30 д for the former, 
and 160-176 x 60-70 w for the latter. It should, however, be remembered 
that lacunæ, possibly representing the phloem (14, p. 96), accompany the 
* It may be recalled that the secretory sacs in Physostoma, while agreeing fairly closely 
in size with those of our seed, are described as tabular in form and assigned to nucellar, not 
integumental tissue (14, p. 97). 
