

PLATE XX. 



Enchytrceus alaskcz sp. nov. 



FIG. i. Transverse section of the body-wall passing through the male-pore 

 and the penial papillae. As will be seen, there are no glands open- 

 ing into the sperm-duct. 



2. Spermiducal pore, sperm-duct, and two penial papillae. 



Fridericia harrimani sp. nov. 



3. Setae fascicle from ventral side. 



4. Section of penial bulb, from a transverse section of the body. 

 Showing that the sperm-duct enters the bulb on one side and 

 nearer the base than in most other varieties. There are two kinds 

 of cells, some of which open into the lower part of the sperm-duct, 

 while others open on the free outer surface of the bulb. 



5. Section of the intestine in somite xin, showing the chylus cell sur- 

 rounded by two epithelial cells and an interstitial cell. The chylus 

 canal is lined by a distinct membrane, the upper part of which is 

 ciliated. At the base of the chylus cell is a blood sinus. 



(166) 



