PLATE XIV. 



Marionina americana sp. nov. 



Fig. I. Penial bulb. The section passes rather obliquely through one side, 

 and accordingly does not give a correct idea of the exterior shape of 

 the bulb. The heavy glandular cells probably open onto the exterior 

 in the same manner as in Mario?iina alaskce. 



Marionina alaskce sp. nov. 



2. Longitudinal section of the body-wall. There are two kinds of cells 

 in the epithelium, the narrower ones being touch-cells. The circu- 

 lar muscular layer is constructed on the nematode plan. 



3. Section of spermatheca taken near the junction of the duct and the 

 ampulla. The cells of the lumen are ciliated. They show a clear 

 zone just back of the cilia, but owing to improper fixation more 

 details cannot be given. The outer dark zone represents the longi- 

 tudinal muscles. 



4. Spermatheca. The figure is constructed from sections, and is accord- 

 ingly only approximately correct as regards the relative size of the 

 parts. The duct is covered with a strong layer of longitudinal 

 muscles. 



5. Lymphocyte. 



6. The penial bulb in longitudinal section. There are two kinds of 

 cells composing the glandular structure, one kind opening in the 

 sperm-duct, the other around the pore. 



(^54) 



