186 NAIADES. 
as I have been able to ascertain, partially due to a disposition 
of its proper cells, and perhaps partly to those of the neck 
of the endostome. "This is worthy of notice, being obviously a 
representation of the highly developed radiated structure of 
a similar part or parts in Lemnacez. 
I think that Naias helps to place in their true light, the 
structure of Ruppia, Zanichellia, and Ceratophyllum. For 
there is nothing in it, that would tend to induce us to as- 
sume that its embryo is formed outside its sac. 
t is by no means probable, if such were the struc- 
ture of the plants alluded to, that it would be abandoned in 
Naias, and this leads me to suggest, that unless the stalk of 
the embryo of Naias, can be considered an embryonary sac, 
the more legitimate supposition is, to consider that the 
embryo is, in all, intra-saccular ; and that the anomalies are 
attendant on enormous development of the podosperm. 
[Traces of stamen deliquescent frond all such broken sub- 
volute, lined in the flaccid membrane. : 
The development is remarkable, and that particular line of 
gradation which suffices us to identify structures at different 
periods of development is so obscured that I am unwilling to 
speak decisively on the male and female or ‘gene ata very 
early period. 
Although the earliest identifiable character of the female is 
the oblong shape of the pistillum, which will be found to be 
open at the apex, the orifice being somewhat bi-lobed, the nu- 
cleus just reaches to the mouth, but is not exserted. ]* 
Explanation of Plate, CCLI. Fig. Il. 
If the apex of the axis be examined at a very early period 
it will be found to present an irregular amorphous summit of 
* The substance of this pencil note (written at time of observation on 
the original rough sketch of the parts oS Pl. CCLI.) is NI: 
rated by the author in what follows. 
