MALE REPRODUCTIVE ORGANS. S3 



the posterior end of the lung ; posteriorly this tube nar- 

 rows greatly, but it may be traced along the dorsal side 

 of the epididymis to near the cloaca, where it ends 

 blindly. It appears to be the unaborted Milllerian duct 

 of the embryo, and therefore homologous with the ovi- 

 duct of the female. 



131. In the cloaca, a short way external and posterior 

 to the proximal end of the urethral groove, seek the 

 small slit-like aperture of each vas deferens. On intro- 

 ducing a probe from the cloaca, the duct may be traced 

 for a considerable distance along the ventral border of 

 the testis. 



132. Raise the testicle so as to stretch the band of 

 peritoneum between it and the epididymis. In this 

 band will be seen a number of small vasa efferentia pass- 

 ing from the testis to the epididymis. Then dissect 

 away the peritoneum covering the epididymis, and ob- 

 serve that the latter organ is made of a much-coiled 

 tube, with its folds bound together by pigmented con- 

 nective tissue. 



133. Turn the left testis and epididymis to the middle 

 line, and push the posterior end of the lung out of the 

 way. The outer half and the anterior end of the ven- 

 tral surface of the red kidney will then come into view ; 

 and, running along it from before back, close to the 

 point where the connective tissue binding it to the epi- 

 didymis is attached, a large vein will be seen. Care- 

 fully trace the branches which enter this ; they are^ 



a. From behind, a trunk from the penis, through 

 which the whole set may be conveniently in- 

 flated. 



