CHANGES IN THE OVARY 143 



formation of the corpus luteum in Marsupials is essentially similar 

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

 to be rudimentary in Dasyurus, a circumstance which rendered it 

 especially easy to follow the subsequent changes undergone by this 

 layer. Sandes describes the follicular epithelium as undergoing so 



FK;. 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 from 

 the theca. The place of rupture is widely open. Haemorrhage 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. 1 



The formation of the corpus luteum in the rabbit has been 



1 Through the kindness of Professor .). P. Hill I have been permitted to 

 examine sections in his possession of the corpus luteum of the Monotreme 

 Omvtharhynelnu /inr<nl<>.i-n*. Tlirsr sections show much hypertrophied and 

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

 connective tissue wall of the corpus luteum. 



