224. The Philippine Journal of Science 1922 
gonidia in the same sexual coenobia. Oogonidia mostly be- 
tween 50 and 150; smaller and appearing later than the gonidia, 
in sister coenobia; differentiated at about the time of the 
growth divisions; about 18 » at time of birth; reaching about 
46 ». Oospores with smooth or slightly wavy walls. Andro- 
gonidia few; about the same size as the oogonidia and scattered 
among them; each forming a sperm platelet of 256 sperms. 
Spermatozoids probably with terminal cilia. 
Habitat.—Fresh-water pools near Manila, Philippine Islands 
(leg. W. R. Shaw, 1914). 
COPELANDOSPHAERA SPERMATOSPHAERA (Powers) comb. nov. 
“First form of Volvox,” Powers in Trans. Am. Microscop. Soc. 27 
(1907) 124-140, 146-148, pls. 11-18, figs. 1-17. 
Volvox spermatosphara Powers in Trans. Am. Microscop. Soc. 28 
(1908) 142-151, 171-172, pls. 23 and 24, figs. 1-23 and 26. 
Volvox spermatosphaera (Powers) West in Journ. Quekett Mic. Club 
II 11 (1910) 101. 
Coenobia spherical or ellipsoidal; 150 to 1,000 » (more com- 
monly 250 to 600 ») at maturity; about 250 » or less at time 
of birth. Somatic cells about 1,000 to 3,000; protoplasts globose 
to ovoid; 6 to 10 yw in diameter (mostly nearer the smaller 
size); about 5 » at time of birth; spaced in adults 28 to 40 
or even 50 » apart. Stigmata large in the cells about the 
anterior pole, gradually decreasing in size backward, and 
becoming invisible not far back of the coenobial equator. 
Reproductive cells 1 to 25, whether gonidia, oogonidia, andro- 
gonidia, or mixtures of two or three kinds in the same coeno- 
bium ; confined to posterior half or three-fifths of the coenobium; 
differentiated from somatogenic cells at about the 256-celled 
stage; about 15 to 18 » at time of birth. The gonidia segment 
after birth, when they reach about 30 to 36 y», and produce 
vegetative coenobia. The oogonia mature at about 51 to 54 un. 
Oospores with a smooth wall around a concentrically placed 
zygote. Androgonidia 1 to 3 » smaller than the gonidia, and of 
different constitution; segmenting more tardily; each producing 
a hollow sphere of 32 to 256 weakly ciliated cells that segment 
forthwith and produce each a platelet of 32 or, sometimes, 64 
sperms. The resulting compound antheridia or “sperm spheres” 
measure about 80 to 180 », have no power of locomotion, and 
usually mature after fecundation of the eggs in the same coe- 
nobium. Spermatozoids compact, with spherical nuclei and 
termina] cilia. 
Habitat.—The shallow remnant of a prairie pond containing 
considerable alkali, Nebraska (J. H. Powers, 1903?); shallow 
