THE OVUM OF THE NINE-BANDED ARMADILLO. 



that I am inclined to offer the tentative suggestion that a bi- 

 laterality of the ovocyte might be initiated here, which under 

 certain conditions might produce a physiological isolation of the 

 two halves of the germ cell and might account for the production 



Q 



4 



7 



5 



8 



in 



%P 



V *VV/. - . ; -:V:'-.. __,>.-. .'JZJ? 



^3i9l&2i \ : 2-j&%tifr 





10 



FIGS, i to 10 (inclusive) show ten stages in the development of the definitive 

 follicle (X50). 



of the paired embryonic primordia that are such noteworthy 

 features of the early development as shown recently in Patterson's 

 photographs. 1 Follicles at this stage measure on the average 

 about .15 X .2 mm. 



1 These photographs were exhibited at the Urbana meeting of the Central Branch 

 of the American Society of Zoologists, held in April 1912. 



