500 The Philippine Journal of Science 1922 
crometer scale with smallest divisions 10 » each, that was pho- 
tographed on the same plate as the specimen, with the same 
adjustment of the apparatus. The daughters are about 125 » 
in diameter and appear to be developing cilia on their cells. 
There are indications that three or four other reproductive 
bodies were present in the hinder half of the coenobium and 
distributed symmetrically. They were either abortive and de- 
generated, or they formed antheridia. 
Another, shown in Plate 5, fig. 17, has six daughters that 
are shown in a posterior polar view. This is from another slide 
of the same collection. The somatic cells mostly appear too large 
because of being out of focus. 
On the same slide with the coenobium having four daughters 
there are fourteen coenobia in about the same degree of maturity. 
They have— 
8, 4, 5, and 6 daughters in 
2, 5, 5, and 2 mother coenobia, respectively. 
With the material just described there is a variety of stages of 
asexual Volvox coenobia ranging from young ones with gonidia 
of about 10 » divided into two cells to older ones with the re- 
productive bodies many-celled. It is not evident at first sight | 
that these are of the same species that is being described here, 
for the somatic cells of these young and intermediate coenobia 
are more robust than those of the type material of Volvox 
barberi, and they appear to be fewer in number. Still, I am 
inclined to believe that they are the same species. They show 
a tendency to have eight reproductive bodies, even when fewer 
are developing. In one such, for example, there are four embryo 
daughters of about 57 » distributed equatorially and forming 
& symmetrical group, and halfway back to the hinder pole 
there is a group of four small reproductive bodies similarly 
arranged. One of these is simply a pair of twin stellate cells, 
each of not quite twice the diameter of the somatic cells. The 
three others are Pandorina-like bodies of about sixteen cells, 
measuring about 18 by 21 up. 
A small coenobium that appears to belong to Volvox barbert 
is shown in Plate 8, fig. 12. It measures about 210 by 250 » 
and contains about 1,800 somatic cells. It is without repro- 
ductive bodies. It serves to illustrate how small and relatively 
few-celled some members of the large, many-celled species 
may be. 
That coenobia of Volvox barberi sometimes occur with both 
asexual and sexual reproductive bodies is shown by a specimen 
