ILLUSTRATIONS 
[Photomicrographs of Campbellosphaera obverse, Shaw, from specimens mounted in Ve- 
netian turpentine, taken by W. R. Shaw and E. Cortes at the Bureau of Science, Manila.] * 
Plate I 
Fig. 1. Type specimen containing three gonidia, two closing bowl embryos 
with their gonidia migrating inward, and two bullet embryos 
of which the gonidia form a close cluster within each closed 
phialopore. X 200. 
2. The same specimen with less magnification and more depth of 
focus. X 100. 
3. A coenobium containing two gonidia and five embryos with a 
foreign body in the background simulating an additional embryo. 
The lower embryo on the right side is the oldest, the upper one 
on the same side being the youngest. X 100. 
4. A nearly mature mother coenobium containing seven asexual 
daughters, in each of which there are from six to eight gonidia. 
X 100. 
5. An asexual coenobium containing four gonidia and two young 
embryos. X 100. 
6. A nearly mature sexual coenobium between two young asexual 
coenobia. The sexual coenobium shows dark oogonia and lighter 
oospores, of which there are twenty-three in all. The asexual 
coenobia contain seven gonidia each. X 100. 
7. A portion of the same coenobium photographed on a larger scale. 
It shows an oogonium, oospores, and somatic cells. A little 
above and to the left of the center of the figure is a young 
specimen of an endophytic alga occupying the angle between 
four somatic cells. X 400. 
8. A younger sexual coenobium containing twelve oogonia and sixteen 
oospores. X 100. 
9. A still younger sexual coenobium containing twenty-five oogonia 
and three antheridia. One of the latter lies near the middle 
of the right side and another is at the top of the same side. 
X about 200. 
Plate II 
Fig. 10. A nearly mature asexual coenobium containing one asexual 
daughter with seven gonidia at the right side of the top, and 
six sexual daughters containing each from twenty-seven to 
thirty-one reproductive cells, more or less. X about 200. 
11. An asexual coenobium containing, in addition to one gonidium 
and four asexual embryos, one sexual daughter (the lowermost 
embryo) with sixteen reproductive cells. 
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