ILLUSTRATIONS 



[Photomicrographs of Campbellosphacra obversa 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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