122 The Philippine Journal of Science 1922 
MERRILLOSPHAERA MIGULAE sp. nov. 
Volvox aureus Ehrenberg, Klein, in Ber. d. deutschen bot. Ges. 7 
(1889) 48-53, pl. 3, figs. 1-10; and in Ber. d. naturf. Ges. Freiburg 
i. B. 5 (1890) reprint 23 and 24, 27 and 28, pl. 2, fig. 4, pl. 4, fig. $2. 
Coenobia spherical or ovoid; asexual usually between 250 and 
350 p», reaching 320 by 425 »; female similar; male averaging 
100 to 150 ». Number of somatic cells, 1,440 to 2,180. Proto- 
plasts ovoid, about 7 to 8 » in diameter. Gonidia 8, sometimes 
more; sometimes of uniform size and arranged in two quartets; 
attaining diameters of 25 ,» before birth of the coenobia con- 
taining them, and probably 62 » before segmentation. Some 
coenobia with gonidia and oogonidia. Female coenobia with 
about 8 oogonidia. Asexual, male, and possibly female coenobia 
formed in the same mothers, and of about the same size at 
time of birth. Antheridia, consisting of sperm platelets of 
about 12.5 » diameter, containing 32 spermatozoids, commonly 
mature before birth of the male coenobia. Oospores with smooth 
walls, 52 to 62 » in diameter. 
Habitat.—Karlsruhe, Germany (leg. Migula, 1888); Buch- 
heim, Alt-Breisach, Hochdorf, Germany (leg. Klein, 18887). 
MERRILLOSPHAERA TERTIA (Meyer) comb. nov, 
Volvox tertius :Meyer in Bot. Zeit. 54* (1896) 188-191, 200-201, 
216-217, pl. 8, figs. A, Z and a, text figs. 5-7. 
Form and size of coenobium not stated. Number of somatic 
cells not given. Somatic protoplasts globose, about 7.5 u». 
Membranes of somatic cells (described very particularly) hemi- 
spherical and of a thickness equal to about one-sixth of the diam- 
eter of the protoplast on the outer side, and prismatic and of 
a thickness equal to about one and a half times the diameter of 
the protoplast on the inner side. Gonidia 4 to 8 in the asexual 
coenobia; attaining diameters as great as 50 » and dividing 
either before or after the birth of the coenobia containing them. 
Female coenobia doubtful. Three coenobia were reported to 
contain 4, 5, and 3 asexually produced daughters and 10, 20, 
and 30 oospores, respectively; that is, gonidia and oogonidia in 
the same coenobium. Oogonidia said to form oospores when 
they reach diameters of 40 to 50 ». Androgonidia produced in 
reproductive half of male coenobium; reach 13 » diameter; 
produce hemispherical or tabular bundles of sperms before the 
birth of the male coenobia. Oospores said to have smooth walls. 
Habitat.—A pool near Marburg, Germany (leg. Meyer, 18957), 
