31 
furnished with a red lateral spot, two contractile vacuoles, and two 
long exserted cilia, all circumscribed within a common hyaline vesicle. 
In sexual propagation certain masculine cells undergo a multipartite 
division into fascicles of mobile spermatozoids, which are contractile, 
ds free. T a 
enlarged, but do not undergo division; after fertilization they develop 
into motionless oospores, which are finally red, surrounded by a double 
epispore.—Cooke’s British Freshwater Alge. 
V. lobator, Linn, Cooke’s British Freshwater Alge. Larger 
, er y I. 
_ Hig. 22 bis. : a, Volvox globata, after A. W. Wills; 5, and c, after 
Cohn, in Cooke’s Freshwater Alow, Lc. ; d, complete antheridium ; 
¢, stellate resting-spores or oosphere x 400, Volvow stellatus. 
‘ Hab . 
Speaking of the Volvocinee, Dr. Carpenter says:—“ The most 
temarkable example of this group in the well known Volvowx globator 
(Fig. 22, bis.,), which is not uncommon in freshwater pools, and which, 
attaining a diameter of about 1-50th or even 1-30th of an inch, may 
fe seon with the naked eye, when the drop ear it is held up to - 
| immi it inhabits 
F a. magnifying power, the Volvox is seen to consist of a hollow 
pully) traversed b ing these spots together. 
rn y green threads connecting these gethe 
From each of the spots proceed two long flagella ; so that the entire 
Search yw; has no daug 
8 the mail probably disclose several cells larger than the rest ; ~o 
__~ riginating cells of what is hereafter to become a new sphere. 
