CHARACTERS OF FISHES. 399 



often set free into the peritoneal cavity, ultimately finding their 

 ( way to the external medium, either by means of an abdominal 

 pore (or pores), or by being taken up by the open mouths of 

 the " Fallopian tubes." In other cases the generative pro- 

 ducts are directly conveyed to the exterior by the proper ducts 

 of the reproductive organs. 



