94 The Philippine Journal of Science 1922 
the same stage. They are the female reproductive cells. One 
daughter, the second from the left in the upper row, measures 
178 by 180 ». The somatic protoplast diameters are about 3.6 pw; 
the intercentral distances, about 4.9 »; and the estimated number 
of cells, 4,850. The oogonia are about 15 » in diameter, number 
about 24, and are distributed just under the somatic layer in all 
except the anterior quarter of the daughter, this quarter being at 
a higher level than the picture plane. Over each oogonium there 
is a vacancy in the layer of somatic cells, this space being sur- 
rounded by seven or eight somatic cells. Each of the other 
daughters shows an area lacking reproductive cells, and all the 
daughters have nearly the same dimensions and about the same 
number of somatic cells and reproductive cells. The smallest is 
145 by 150 », the largest 175 by 190 ». The oogonia were counted 
and measured in three other daughters which are above the 
median plane. The counts are 27, 37, and 31, and the measure- 
ments 13, 15 (exceptionally 11 and 16), and 14 y, respectively. 
The smallest oogonia are a few of those in the coenobium that 
contains the largest number. The oogonia are vacuolate proto- 
plasts, each with a central nucleus and with parietal chromato- 
phores. No membranes can be seen except the outer limiting 
membranes of the mother and of the daughters. The position 
of the inner lamella of the embryo capsules seems to be marked 
by confinement of the cilia of the daughters to a space having 
a width that is much less than the length of the cilia. 
A nearly mature female coenobium (specimen 7) from 
slide 1 of the type lot is shown in Plate 1, fig. 4. This 
specimen measures 264 by 380 », and has a thickness, in its 
compressed condition under the cover glass, of about 186 ». The 
somatic protoplasts are 4.4 ‘to 5.3 » wide, and the distances 
between their centers are, approximately: Anterior, 12.5 p; 
equatorial, 10 »; posterior, 9 »; and mean, about 10.2 ». The 
estimated number of somatic cells is 4,850. Distributed in 
about three quarters of the coenobium, and located about 25 yu 
below the outer surface, there are twenty-nine reproductive cells, 
of which five have thickened walls which mark them as oospores. 
These oogonia are mostly about 27 » in diameter, two exceptional 
ones near the posterior pole measuring 22 and 25 n, respectively. 
Over each reproductive cell there is a vacancy in the layer of 
somatic cells, each such space being surrounded by about six 
somatic cells. In the reproductive region, and anterior to the 
equator, there are discernible five vacancies in the somatic layer 
without corresponding reproductive cells. These may be the 
