XVII 



PKOTOCHOEDATA 



601 



the myotomes, and which project into spaces derived from the posterior 

 lower angles of the myocoeles, as the cavities of the myotomes are 





r "2 E & 



called. These spaces form the gonocoeles of the adult: they soon 

 become cut off from the myocoeles from which they are, derived l>y 

 the growth of septa, and each gonad projects into the gonocoele 

 derived from the myocoele in front of the one to which it belongs. 



