Philippine Journal of Science 
520 
Fig. 12. A sexual coenobium between two asexual ones. The former con- 
tains fifteen reproductive cells, of which thirteen are oogonia 
and two are oospores. The asexual coenobium at the right 
contains seven gonidia; two pairs of larger ones in the pos- 
terior half of the coenobium (uppermost in the figure) and three 
smaller gonidia in the anterior half. The coenobium at the 
left contains two pairs of large gonidia in the posterior half, 
one smaller gonidium in the anterior half, and a still smaller 
anomalous cell like a gonidium at the posterior pole. X 100. 
13. An asexual coenobium with seven embryos. It shows end and side 
views of bullet embryos, and a side view of a bowl embryo 
with the gonidia (8) obviously outside of the bowl. X 100. 
14. An asexual coenobium with three pairs of gonidia. X 200. 
15. An asexual coenobium with one gonidium and six embryos which 
are all in the bullet stage, the daughter gonidia being closely 
clustered about the posterior pole of the coenobial cavity. 
X 200. 
16. The same coenobium in slightly different focus. X 100. 
17. An asexual coenobium containing seven embryos, in each of which 
the gonidia have become separated. X 100. 
TEXT FIGURE 
Fig. 1 . Phylogeny of the Volvoceae. 
