No. 2.] COMPARATIVE CYTOLOGICAL STUDIES. 



;oi 



Form. 



A Single 

 Nucleolus. 



More than One Nu- 

 cleolus, All Alike. 



Nucleolus and 

 Paranucleolus. 



* (O. Hertwig) 



* (Brauer) 



* I (O. Hertwig) 



* (mihi) 



