XIII 



PHYLUM CHORDATA 



As the ovum approaches maturity the fluid liquor folliculi in 

 the cavity of the follicle increases in quantity, so that the follicle 



Fia. 1143. Various forms of uteri in Eutheria. A, 13, C, D, diagrams illustrating the different 

 degrees of coalescence of the oviducts. A, two distinct uteri. B, bicornuate uterus. C, 

 uterus with a median partition. D, complete coalescence. E, female reproductive organs 

 of one of the Mustelina with embryos (* *) in the uterus. F, female reproductive organs of the 

 Hedgehog. B, urinary bladder ; Ce. cervix uteri (neck of uterus) ; N, Nn, kidneys and 

 adrenal bodies ; Od. oviduct ; Ot. ostium tubse (abdominal opening of oviduct) ; Sug. arino- 

 genital sinus ; r. rectum ; Ur. ureters ; Ut. uterus ; Vg. vagina ; t tj accessory glands. (From 

 Wiedersheim's Comparative Anatomy.) 



becomes greatly distended. The follicle has, meanwhile, approached 

 the surface of the ovary, on which it comes to project as a rounded 

 prominence. Eventually the middle region of the projecting part 



