226 The Philippine Journal of Science 1922 
assumed that they were probaly too fine to be visible with the 
magnification used or with the fixing and mounting media em- 
ployed. Until the Volvocaceae have been studied in all quarters 
Campbellosphaera Janetosphaera 
obversa aurea 
Merrillosphaera Volvox 
carteri rousseleti 
M. migulae V. barberi 
M. africana V. merrilli 
x i 
M. tertia V. perglobator 
< 
Copelandosphaera - globator 
spermatosphaera | 
Cc. dissipatrix 
Besseyosphaera 
powersi' 
Pleodorina ‘ 
californica 
P. illinoiensis 
Platydorina 
caudata Se 
Eudorina elegans 
Stephanoon 
coo Ra a 
Gonium pectorale 
Pandorina morum Spondylomorum 
quaternarium 
Stephanosphaera 
pluvialis 
G. sociale 
G. lacustre 
Chlamydomonas Sphaerella Carteria 
Fic. 2. The phylogeny of the Volvoceae. All the genera above the horizontal line are of this 
subfamily except Stephanosphaera and Spondylomorum, The latter are sometimes so treated 
for convenience. The genera below the horizontal line are unicellular. 
of the globe it will be conducive to more discriminating investi- 
gation of the members of the group if the species remain seg- 
regated in their several genera. Subgenera are not equally 
