502 
Philippine Journal of Science 
1919 
cells, of which twelve with diameters of about 29 p are darker 
and thin walled, and sixteen with diameters of about 34 p are 
lighter in color (they appear to have taken up some Bismarck 
brown but no nigrosin) and enveloped with walls which vary 
in thickness and in closeness of fit, the thicker ones fitting their 
protoplasts more loosely, and all having reticulations developed 
as ridges. One thin-walled reproductive cell* on the far side 
of the coenobium is smaller, about 25 p, and lighter colored 
than the others, and may possibly be an endophyte. The coeno- 
bium measured about 250 by 275 p when it was photographed 
and now is 230 by 255 p. The somatic protoplasts have diam- 
eters of about 4 to 5 /x and are in the outer rounded ends of 
their prismatic membranes. The average cell diameter is about 
9.4 w. The estimated number of somatic cells is 2,300. That 
this coenobium is younger than the one shown in Plate I, fig. 
6, is evident, not only from the larger proportion of oogonia to 
oospores, but from the incomplete development of the oospore 
walls. The large number of relatively less-mature endophytic 
algae also marks this coenobium as younger than the other. 
The reproductive cells are absent about the anterior pole, and to 
a lesser extent about the posterior pole, though the latter point 
is more evident in the present position of the coenobium than 
in that which it occupied at the time when the photograph was 
taken. The radial dimensions of the somatic-cell membranes 
does not reach the size of those in the preceding specimen. 
Notes on the four other specimens of sexual coenobia on the 
type slide, taken in June, 1919, follow: 
Specimen 15 . — Coenobium ovoid, 235 by 245 m. Anterior end larger. 
Somatic prisms about 20 m radial dimension about the anterior pole. 
Oogonia, 28; 39 m, with central nucleus; a zone of dark bodies, possibly 
chromatophores, about one-fourth or one-fifth radius from the periphery 
and one-half or three-fifths radius from the center of the protoplast. 
Specimen 16. — Coenobium, 210 by 270 p. Somatic protoplasts, about 
5 p. Average cell diameter, about 10 p. Estimate of somatic cells 1,920. 
Reproductive cells, 23. Oogonia, 16; 30 to 35 p. Oospores, 7; protoplasts, 
about 32 p, walls about 40 p. Each oogonium has a central nucleus and 
dark bodies in the outer half of the radius. The oospores have a small 
central nucleus or nucleolus. Two have walls almost smooth. The pro- 
toplasts are eccentric. Three oogonia and one oospore appear more or 
less disorganized and are surrounded by fungus hyphae. 
Specimen 17.— Coenobium, 260 by 295 p. Cells, about 2,330. Reproduc- 
tive cells, 25. Oogonia, 2; 32 and 35 p. Oospores, 23; grading from dark 
to light, 19 being darker and 4 lighter, the latter nearer maturity. Ridges 
on spores high. Most spores with nucleus eccentric, twice as far from 
one side as from the opposite. 
