PLATE V. 



Mesenchytrceus maculatus sp. nov. 



FIG. i. Nephridium. 



2. Penial bulb and chamber, from a transverse section of the body. 



3. Nephrostome, side view. 



4. Anterior somites, side view. The large white shield is an unpig- 

 mented field surrounding the spermathecal pore. 



5 Atrium, just outside of the penial bulb, from a cross-section of the 

 body. Only two of the atrial gland fascicles are partly delineated. 

 Their ducts are seen to open into chambers situated between the 

 epithelial cells. These pockets are filled with eosinophil granula- 

 tions from the glands. 



(136) 



