§ 8 



FREQUENCY IN DIFFERENT GROUPS 



115 



i936-'4o). In man, a pre-ovulation corpus luteum (LEO- 

 POLD, 1883), and a ruptured and ill-developed follicle which 

 might, morphologically, be regarded as calyx (DUBREUIL, 

 1940), have also been described as exceptional cases (vide 

 Table IV). 



TABLE IV 



Frequency of follicular derivatives 



group 



calyx and 

 pre-ovuUorp.lut. \post-. 



pre-\ovuiai 

 Hair.cl. 



ovulat atretic and post- 

 corp. luteum 



ovul. 



r upturn 



Corp. 

 atretic 



retent. ovum 



mix turn 



simplex 



post-ov 



C.I. 



solidum 



prae- 

 ovul. 



C.I. 



Elephantulus typ. 



ruptum 



retent. ovum 



simplex 



calyx 



nutr ret ovum 



nutn simplex 



simplex 



Anamnia 



Amniota 



9~, 



I 



These exceptions confirm our view that the follicle in 

 vertebrates has great potentialities. 



TABLE V 



post-ov 

 Corp. L I 



!® 



prae-ov 

 corp.l. 



calyx 



Cyclost 



Selach. Tel east Amph 



Reptil. Aves \Monotr. Ma mm. 



Anamnia 



Amniota 



Sauropsida Mammalia 



