506 
Philippine Journal of Science 
1919 
tions. In many of the sexual daughters sperm platelets are 
present in the unborn daughters. In no case were antheridial 
coenobia seen in the mother coenobia of this species, though 
they are common in the V. africanus coenobia mixed with them. 
The staining of this material does not fit it for making photo- 
micrographs with distinct detail. For this reason I present 
without illustration the descriptive data pertaining to two 
selected specimens: 
Specimen 25 . — Mother coenobium, 250 by 275 m. Estimate of somatic 
ceils, 2,850. Daughters, 7 ; three asexual in a forward group and four 
sexual in two pairs in the posterior half of the mother. Each asexual 
daughter contains eight gonidia, of which the diameters range from 18 to 
21 as 18 to 21 as and 19 to 25 r. The youngest asexual daughter measures 
70 by 75 as and the eldest, 90 by 95 as The latter has an average somatic 
cell width of 3.7 r and an estimated, number of somatic cells of 2,190. 
One of the sexual daughters measures 95 by 110 m and has an average 
somatic cell width of 7.5 r and an estimated number of somatic cells of 645. 
It contains eight oogonia of about 19 r and eight antheridia. The latter are 
sperm platelets more or less dished. Another sexual daughter contains 
twelve oogonia and four antheridia, one of the latter being hemispherically 
cup-shaped. A measurement of 23 e- across the mouth of the cup, with about 
1.8 a 4 for the spacing of the sperms, gives an estimate of more than two 
hundred fifty-six for the number of sperms in this antheridium. The next 
daughter contains sixteen oogonia and no antheridia, and the last one 
fifteen oogonia and one antheridium. 
A number of gonidia, or gonidial products, greater than eight 
was noticed in only one specimen that could be certainly iden- 
tified as belonging to this species . 2 It is on the same slide as 
the preceding. The generic characters presented by the em- 
bryos render its identity unmistakable. A description of it 
follows : 
Specimen 26. — Coenobium, 210 by 220 r. Somatic cell width, 8 a*. Num- 
ber of cells, 2,570. Contents, 4 gonidia and 5 embryos. The gonidia lie 
near the coenobial equator, in advance of it, and measure. 44, 50, 50, and 
54 A'.. The embryos are grouped in the hinder part of the mother. Four 
are in the closing bowl stage and one, the hindmost, is in the bullet stage. 
The extent of the cell membranes around the gonidia and the 
embryos produced from them is not easily discernible, even in 
much of the material which has been stained with Bismarck 
brown. Although the inner limit usually becomes visible as 
2 The only other specimen containing more than eight gonidia on this 
slide is one with dimensions 190 by 205 as average cell width, 4.2 as 
number of cells, 7,800; and nine gonidia, all of which measure about 
40 as except one near the posterior pole, which is 36 ' This is probably 
a specimen of Volvox carteri Stein ( V. iveismannia Powers). 
