512 Philippine Journal of Science 1919 
for a more complete account of the species than has yet been 
published. 
Another species with megalogonidia and other characters 
similar to those of Campbellosphaera was described by West 
(’10) from Albert Nyanza under the name Volvox africanus. 
This species also has the gonidia differentiated at an early 
embryonic stage. The original account of this species is suf- 
ficiently complete to mark it as entirely distinct from Campbello- 
sphaera, though in form and size of the coenobia it approximates 
the characters of the latter. 
Several varieties of Volvox africanus are abundant in my 
Philippine material, which should serve as a basis for a more 
complete account of this species also. 3 
A species of Volvox found by Meyer (’96) in Germany, and 
called by him V. tertius, resembles Campbellosphaera in having- 
large gonidia, which are probably differentiated early, and in 
having round somatic protoplasts without protoplasmic connec- 
tions. Meyer’s text figure 7 would serve as well for a diagram 
of a radial section through the somatic cells of Campbello- 
sphaera obversa if the outer peripheral membrane, or cuticle, p, 
were absent, leaving the intercellular spaces, 0 , continuous with 
the surrounding space. Volvox tertius appears to be more 
nearly related to Campbellosphaera than to the older species of 
Volvox. It is unquestionably distinct from both V. globator 
Ehrenberg and V. aureus Ehrenberg. Still there is lack of a 
sufficiently complete description to enable us satisfactorily to 
assign it to its place among its kindred. 
Some specimens, collected and prepared by Doctor Migula, 
of Karlsruhe, were described and figured by Klein (’39B) under 
the name V. aureus, which I believe to have been an incorrect 
use of the name. Six of the eight coenobia figured (Plate 3, 
figs. 1 to 3 and 6 to 8) show daughters containing gonidia, 
gynogonidia, and androgonidia, all so large as to indicate plainly 
that the specimens belong to a megalpgonidiate species. It is, 
therefore, questionable whether the cells that Klein called fer- 
tilized eggs (“kiirzlich befruchtete Eier”) were really such and 
* At the present time, June, 1919, the manuscript is partially prepared 
of a paper describing at length Volvox carteri and V. africanus and pro- 
posing for them a new genus to be known as Merrillosphaera. The leading 
species of this genus will then be; Merrillosphaera carteri (Stein) Shaw 
(synonyms: Volvox globator Carter non Ehrenberg, V. carteri Stein, V. 
iveismannia Powers) and Merrillosphaera africana (West) Shaw (syno- 
nym: Volvox africanus West). 
