482 The Philippine Journal of Science 1922 
The oogonidia occur in numbers ranging from 1 to 15 like 
the gonidia, though mostly 3 to 8, and more seldom 6 to 10. 
The oospores are spherical, with two somewhat eccentric 
smooth membranes. They are brownish red (orange red in glyc- 
erine), and measure 60 to 65 or even 70 » in diameter. 
In regard to the foregoing synopsis of the characters of Janet- 
osphaera aurea (Ehrenberg) Shaw, as stated by Klein (’90) 
under the name of Volvox aureus Ehrenberg, it is to be remarked 
that incorporated therein are characters drawn from material 
wrongly identified by Klein as of this species. The material col- 
lected by Doctor Migula at Karlsruhe and described by Klein 
(’89A, figs. 1 to 8) under this name appears clearly from the 
figures to be at most a variety of Volvox 
carteri Stein. The latter is so different 
st from the earlier described species of Vol- 
£2 vox that it has been made the type of 
another genus, Merrillosphaera (Shaw ’19, 
= DP. 512, footnote), described in another 
% paper. Possibly still other species con- 
tributed some of the material to the make- 
= up of this composite synopsis. The prepa- 
\; ration of a true statement of the characters 
of Janetosphaera aurea is a task for some- 
Weise Egsgsoenncke , One familiar with the species in its Euro- 
gram of cells and mem- Dean habitat and one to be undertaken 
ots pollo te era with the related species and genera that 
: have been found in other quarters of the 
globe in mind. 
The most important addition made to our knowledge of Janet- 
osphaera aurea subsequent to the accounts of Klein (89 and 
’90) and Overton (’89) is the description by Meyer (’96) of the 
cell membranes of the somatic cells. According to this account 
each somatic protoplast is surrounded by a thick gelatinous 
wall that is separated from that of the neighboring protoplasts 
by a firmer middle lamella (text figs. 1 and 2,m and m’). Con- 
tinuous with this middle lamella there is a cuticular covering 
that bounds the gelatinous membrane on the outer side. This 
is united with a common cuticular membrane, p, covering the 
coenobium. But on the side of each cell toward the center 
of the coenobium there is no firmer limiting membrane near 
the protoplast. The intercellular middle lamella, m’, is simply 
attenuated toward the center of the coenobium and extends far 
in that direction, the lamellae of different ages being attenuated 
