490 The Philippine Journal of Science 1922 
taining, however, its cavity and showing spermatozoids with 
cilia directed outward on all sides. These cilia do not project 
similarly from all of the spermatozoids; one side, even while 
the globoid is still within its parental lodgment, always shows 
the cilia radiating from a center; toward the periphery they 
bend around the sides and extend straight backward, as do all 
those on what may be called the posterior side.» The sperm 
masses seem always to escape outward into the surrounding 
water, never into the interior of the coenobium. Among mate- 
rial rich in male coenobia these groups of sperms were readily 
found, swimming with vigorous independence among the various 
coenobia. The locomotion of the sperm globoids is by a rapid 
spiral rotary movement with one pole habitually directed fore- 
most. . 
The number of sperms in a globoid was not estimated, though 
it was thought to be twice as great as the maximum number 
that had been given previously for the sperm platelets of any 
species. The sperm globoids were subject to some variation. 
In material from climates less sunny than that of Nebraska, 
as Maine and Michigan, the globoids do not always become 
complete. The form is the same, but a small round opening 
remains on one side. 
The spermatozoids, Powers stated, are shorter and smaller 
than any he had seen before. : 
Photomicrographic figures used by Harper (‘18) to illustrate 
his paper on binary fission in Volvoz all appear to represent a 
true Volvox rather than a Janetosphaera. They show stages in 
the segmentation of the gonidia. It may be that these are the 
only figures yet published that show anything of Volvoz per- 
globator. 
VOLVOX ROUSSELETI West. 
This species was based on asexual coenobia collected from & 
pool near the station at Gwaai in Rhodesia, Africa, by C. F. 
Rousselet, in September, 1905. The description by West (’10) 
is illustrated by photomicrographic figures of young and old 
coenobia and of a group of somatic cells. West (718) supple- 
mented the original description by giving an account of sexual 
and mixed coenobia that were found in material collected by 
A. W. Jakubski, on his trip of 1909-10, in the Ussangu Desert, 
. *The posterior side is probably the region about the site of the phia- 
opore, 
