20, 5 Shaw: Janetosphaera and Volvox 503 
‘pole in more mature coenobia. A sketch from living material 
of V. barberi was made on July 31, 1914, and is reproduced 
herewith as text fig. 5. This represents an optical section view 
of the coenobium wall of a nearly mature asexual specimen. 
The pear-shaped protoplasts are more especially characteristic 
of the hinder parts of the coenobia. In the forward parts the 
protoplasts are-ovoid. 
The following key to the species of Volvoz is offered in the ab- 
sence of data that would be necessary for the construction of a 
key based entirely on vegetative or asexual characters. 
Key to the species of Volvox. 
1. Oospore walls angularly wavy. V. globator. 
1. Oospore walls crenate V. perglobator. 
1, Oospore walls spinose 2. 
2. Sexual coenobia dioecious V. rousseleti. 
2. Sexual coenobia monoecious. 3. 
8. Somatic protoplasts large and broad...........----------------sesesereee Vv. merrilli. 
8. Somatic protoplasts small] and narrow V. barberi. 
A form of Volvox described 0+” 
by Carter (’59) at Bombay, In- | 
dia, was identified by him with jo 
Volvox stellatus Ehrenberg, a 
species reduced by all European 4,1 
workers to V. globator. This 
form is most nearly like the two 4,4 
Philippine species. Though the — ss 
descriptive data furnished by ,,] 
Carter are insufficient to enable - —~C 
one with certainty to assign the solp the | 
form to one or the other of the ee ee 
Species, the evidence’ is rather,” cuc-war er-« ncotv sistas “secraal 
in favor of considering it to be — coenobium, in optical section from a 
. living specimen, showing protoplasts and 
V. barberi. the visible limits of the membranes. 
SPECIES EXCLUDED FROM VOLVOX 
Species that have been described under the name of Volvox 
and that are to be left out of this genus and assigned to 
other genera are: Volvox carteri Stein (’78), for which V. 
weismannia Powers (’08) is another name, V. tertia Meyer 
('96), and V. africana West (’10), all of which are characterized 
by having rounded protoplasts without connecting filaments 
