THE NECTURUS 57 



Mesonephros 



The long mesonephroi extend along the dorsal wall of the 

 body cavity. On the lateral border the convoluted Wolf- 

 fian duct is very distinct. Trace its entrance into the 

 cloaca if possible. It must carry the waste from the 

 mesonephros as well as the seminal fluid. A small elon- 

 gated, sac like body, the urinary bladder, should be 

 identified. 



Drawing 20. Make a drawing showing the parts of the urogenital 

 system of the male. 



