CHAP, X.] 



THE DEVELOPMENT OF THE CAT. 



353 



Fig. 15S. — DiAGEAM OF THE DEVELOPMENT OK GENERATIVE ORGANS. THE BODY IS SUPPOSED TO 



be cot through vertically, and the urinary and generative organs of the 

 Left Side to ue viewed Laterally. 



A. The earliest or neutral condition, the sexual 



glanrl (s;?) being as yet un<lifterentiatecl into 

 eitlier ovary or testis, ami the Wollliau 

 lioily ()'•) anil duet (leif;, ami the MulleriMii 

 duct (m), all co-existing with the jierniauent 

 kidney (A:) and ureter ()r/', the ]iaiiilla(/7)) on 

 the ventral side of the o]iiMung of the 

 urethni («/i) being rudimentary. 



B. Here the neutral state is changing into the 



complete female condition. The sexual 

 gland (sj/») has l)eeome an ovary. The 

 Wolflian body and dui't (v an<l wd) liave 

 almost aborted. The remnant of the 

 Woltfian body (v) has become the I'ai- 

 ovariuni and Gaertner's iluct. The Mul- 

 lerian duet (i») has expanded and opened at 

 its free eml, and bec(nne a Fallopian tube, 

 the lower end of which has coalesced with 

 its fellow of the op]iositc side to form the 

 vagina (v) and uterus {us). The opening 

 Ot tlie cornu of the right side is seen at v<:. 



C. Hero ihc neutral state is changing into the 

 comidete male condition. The .sexual 

 glanil (.sv/O lias become a testis, and has 

 travelled liackwards and downwards into 

 the scrotum (s) — its original position being 

 indicated by dotted lines. The JIullerian 

 duet (m) is reduced to a rudiment, the pros- 

 tate has developed {ffl), and the rudimentary 

 ]iapilla. has become a relatively large organ 

 d'), which is represented as truncated. 



a. Anal aperture. al. AUantois. b. Bladder. 



c. Clitoris. /,. Kidney. m. Muller's duct. 



or. Opening of right uterine cornu into uterus. 



jii/. Prostate gland. 



I'll. Kudimentary papilla, which becomes the 

 penis in tlie male. 



s. Scrotum. 



s;j. Undifferentiated sexual gland. 



sjyo. Ovary. s(jt. Testis. ulu Uretlira. 



1(8. Uterus. Mf, Ureter. v. ^'agina. 



v.\ Wolffian body. v.'d. ■\Voltliati duct 



A A 



