t 
21,1 Shaw: Merrillosphaera 95 
sites of antheridia, but I do not think it likely. The oospore 
walls are not very strongly developed. They measure about 
32 » across, except one containing a protoplast which appears to 
be pathologically plasmolized into a bowl shape, and this wall 
measures 35.6 pw. These walls are smooth, and concentric with 
the protoplast, except one which is eccentric. 
A more-mature female coenobium, one containing nearly ripe 
oospores, is shown in Plate 4, fig. 24. This specimen (No. 8) 
is in a collection taken from Pond I, less than a hundred yards 
from Pond C, in Pasay, October 5, 1914. It is on slide 1 of 
a lot of picro-nigrosin glycerine preparations made from the 
same collection. The cover glass is supported only by a shellac 
ring and has flattened the large coenobia, reducing their thickness 
to about 112 ». The cleft in the forward pole is a result of the 
cover-glass pressure. Measurements of coenobia in such a flat- 
tened condition are not very satisfactory, and those made of 
this one in 1921 do not accord with the dimensions of the 
photograph. The specimen now measures about 693 » wide and 
' 737 » long. The average spacing of the protoplasts is about 
13.3 », and the number of cells is estimated to be between 6,000 
and 8,000. The protoplasts are about 6 by 7 » in diameter. 
There are thirty-six mature oospores, and there are two un- 
matured reproductive cells with them. The two dark bodies in 
the anterior circumpolar region are a green endophyte like a 
Chlorosphaera. The oospore walls shown in Plate 4, fig. 29, 
have a very slightly wavy appearance that is more pronounced 
in direct view of some spores. They measure in outside diameter 
about 50 », appear to be about 2.5 to 3 » thick, and contain 
protoplasts that are mostly about 39 » thick and in contact with 
the wall at one side and therefore eccentric. 
MALE COENOBIA 
A mature asexual coenobium containing male and asexual 
progeny is shown in Plate 1, fig. 5. This specimen (No. 9) 
is on the same slide as the female coenobium described in the 
preceding paragraph. This mother coenobium is turned away 
from the observer approximately 22°. On the farther side of 
the coenobium there is in the somatic layer a cleft about large 
enough for the birth of an offspring. If one of the progeny 
passed through that cleft it was the member of the anterior 
quartet located on the farther side. There remain in the an- 
terior quartet an asexual and two male coenobia, and the pos- 
