a remarkable Epizoic Oligochoite. 



liO 



mouth, placed rather on the ventral surface, is boujided 

 ilorsally by the })rostoinium, and vcntrally and laterally by 



Int. 



Aspidodrilus kelsalli. Ventral view of another specimen, at a similar 

 magnification. 



^4y/., anus; Ch., rows of chnetaj on "shield"; Int., intestine (seen by 

 partial transparency) ; ;!/, mouth ; N, ventral nerve-cord ; Sh., frilled 

 margin of " shield " ; Su., sucker. 



the first true segment or peristomium, which, however, does 

 not appear to be separated by a detinite septum from the 



