FURTHER DESCRIPTION OF GENERA 
Callipeltis cucullaria 
The genus Callipeltis embraces three species indigenous to the 
Mediterranean region. In general habit they resemble closely the 
plants of the genus Ga/zum, from which, however, they differ in 
their smaller size. Callipeltis cucullaria, the species studied, was 
collected in growing condition in the Botanical Garden at Berlin. 
THE NUCELLI 
The nucelli, two in number, arise as in Vaz//antia, on either side 
the center of the floor of the ovary. Nor is their course of de- 
velopment different from that already described for that genus, 
excepting in matters of only minor moment, and these are to be 
found in the total number of cells in the nucellus, the greater rela- 
tive amount of archesporial tissue, and in the shape of the 
definitive ovule. 
The archesporium, the cells of which are more numerous than 
in Vaillantia, is evident when the nucellus is quite small ( ۸/۰ 5, fig. 
7). The epidermal capping cells remain without any further 
growth, while immediately around the area occupied by them, the 
integument grows out, as is made evident by the numerous peri- 
clinal divisions to be seen at this stage (pl. 5, figs. 2 and 3). 
By subsequent growth, the integument is developed so as to 
shut in a long micropylar canal (p/. 5, fig. 4). As the ovule 
attains its definitive form, the absence of the large special cells 
seen in the ovule of Vaillantia is noticed, and the sporogenous 
cells of the archesporium divide. The division into four meg- 
` aspores is by no means complete for each cell. Some of 
them, the more centrally placed, divide more rapidly and com- 
pletely, while the more peripheral lag behind and sometimes fail of 
division, or perhaps divide but once, and so a heterogeneous 
mass results, out of which the megaspore which develops into 
the embryo-sac makes its way into the micropylar canal. In such 
Memoirs Torrey Botanical Club, Volume VIII. 
[No. 1, Part 2 (pp. 27-112), issued Ei February, 1902.] 
