228 The Philippine Journal of Science 1922 
STEPHANOON 
Cells 16, in two alternating rows on the equatov........ S. askenasii Schewk. 
PANDORINA : 
Cells 16 or 32, crowded, each with a single chromatophore and pyrenoid. 
P. morum Bory. 
EUDORINA 
Cele. 16, Soe Gr Gb isi ec teens geiesi .... E, elegans Ehrenb. 
PLEODORINA 
Cells 32, rarely 16 or 64; gonidia not more than twice the diameter of the 
vegetative cells which constitute the anterior quartet. 
P. illinoisensis Kofoid. 
Cells nearly 128, rarely 64, 32, or fewer; gonidia about two to three times 
the diameter of the vegetative cells; vegetative cells constituting the 
greater part of the anterior hemisphere.................. P, californica Shaw. 
BESSEYOSPHAERA 
Cells about 1,000; gonidia 10 to.78, distributed in two-thirds to four-fifths 
of the coenobium, developed in daughters after birth. 
B. powersi (Powers) Shaw. 
COPELANDOSPHAERA 
Cells 9,000 to 25,000 or more; gonidia 4 to 15; sperm platelets in monoecious 
COONOUIS oi C. dissipatrix sp. nov. 
Cells 1,000 to 3,000; gonidia 1 to 25; sperm a. pintalele in sperm spheres. 
C. spermatosphaera (Powers) comb. nov. 
MERRILLOSPHAERA 
1. Coenobia strongly ovoid; gonidia in pairs; those of the posterior pair 
the smaller M. africana (West) Shaw. 
1. Coenobia subglobose or ellipsoidal; gonidia mostly about equal and in 
fours. 
2. Gonidia and oogonidia in separate coenobia.... M. carteri (Stein) Shaw. 
2. Gonidia and oogonidia in the same coenobia. 
3. Oospores of about the same number as the gonidia. 
M. migulae Shaw. 
3. Oospores more numerous than gonidia........ M. tertia (Meyer) Shaw. 
CAMPBELLOSPHAERA 
Gonidia 8 or less; anterior gonidia usually the smaller when not all are 
alike C. obversa Shaw. 
* _‘ JANETOSPHAERA 
Oospores with eccentric double walls J. aureus (Ehrenb.) Shaw. 
VOLVOX : 
1. Oospore walls angularly wavy V. globator (L.) Ehrenb. 
1. Oospore walls crenate..... Se ‘.....-. VW. perglobator Powers. 
1. Oospore walls spinose. 
2. Sexual coenobia dioecious ao V. rousseleti West. 
2. Sexual coenobia monoecious. 
3. Somatic protoplasts large and broad V. merrilli Shaw. 
3. Somatic protoplasts small and narrow........................ V. barberi Shaw. 
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