CHANGES IN THE OVARY 



143 



formation of the corpus luteum iu Marsupials is essentially similar 

 to what it is in the Eutheria. The theca interna folliculi is shown 

 to be rudimentary in Diisyurus, a circumstance which rendered it 

 especially easy to follow the subsequent changes undergone by this 

 layer. Sandes describes the follicular epithelium as undergoing so 



Fig. 42, — Discharged follicle of rabbit nineteen hours after coition, or 

 about nine hours after ovulation. The epithelial cells are in process 

 of hypertrophy and there is some ingrowth of connective tissue fi'om 

 the theca. The place of rupture is widelj' open. H:emorrhage is 

 slight. Outside the follicle are old luteal cells of large size. (L. F. 

 Messel.) 



great an hypertrophy prior to the thecal ingrowth as sometimes 

 almost to fill the cavity of the discharged follicle, so that there 

 could be no possibility of confusing the epithelial with the connective 

 tissue cells. ^ 



The formation of the corpus luteum in the ral)bit has been 



' Through the kindness of Professor J. P. Hill I Lave lieen peiniitted to 

 examine .sections in his possession of the coipus luteum of the Monotrenie 

 Oriiitlii>rhiinrliU!< parado.rns. These sections show much hypeilrophied and 

 apparently fully developed luteal cells, but no trace of any ingrowth from the 

 connective tissue wall of the corpus luteum. 



