374 



HERBERT P. JOHNSON. 



elongated, which stain strongly with hematoxylin. The muscu- 

 lar layer is no thicker than in other portions of the alimentary 

 canal. 



Following the stomach is a constricted portion occupying 

 somite IX. or X., which in turn leads directly to the intestine. 



Fig. 2. Portion of another specimen, mounted in same way, more magnified^ 

 Bunches of sperm cells, ova, and intestine seen by transparency. X 37-5- 



As very commonly in the Polychseta the latter is expanded in 

 every somite and constricted at every septum. In especially 

 well-cleared specimens a beautiful vascular network is seen to- 

 cover the peritoneal surface of the intestine. 



