John Bruce MacCalium 359 



Here they come into contact with the Malpighian corpuscles, with the 

 walls of which they seem to fuse, so that the tubules come to com- 

 municate Avith the cavities contained hy Bowman's capsules. ' This is 

 shown in Figs. 16 and 17. It will readily be seen that a communication 

 is thus established between the testis tubules and the Wolttian duct 

 through the Malpighian bodies and tubules of the Wolffian body. The 

 testis tubules break into only the anterior ten or twelve Malpighian 

 bodies, so that the anterior tubules (10 or 12) are the only ones in con- 

 nection with the testis. From these tubules the head of the epididymis 

 must be formed. From the Wolffian duct the rest of the epididymis 

 and the vas delferens arise. This mode of secondary communication 

 between the testis and the Wolffian tubules is not unknown in the lower 

 classes of vertebrates. 



