PLATE XXXVI 



■"' 



\ B C— THREE STAGES IN THE METAMORPHOSIS OF A SIMPLE W IDIAN. 



IN A AND BTHE MOUTH LIES ABOVE IHE ORGAN OB ATTACHMENT ON THE RIGHT AND .THE 

 BRAIN IS BETWEEN THE MOUTH AND THE ATRIAL OPENING. IN B THE POSITIONS ARE S'MILAR, 

 BUT THE TAIL IS DEGENERATING. IN C I. IE MOUTH HAS sH , FTEDT, .THE FREE E N D AN I > I II K 

 ATRIAL OPENING TO THE LEFT SIDE OF THE FIGURE. I ». BALANAGLASSl 5 KOWALEl ShJl 



AFTER SPENGEL, THE ANTERIOR END WITH PROBOSCIS ON THE RIGHT. 



•E.—CEPHALODISEUS DODECALOPHUS, VENTRAL VIEW. AFTER MTNTOSH. 



F.— DIAGRAMMATIC MEDIAN SECTION OF SAME SHOWING PORTION OF 



BUCCAL SHIELD VBOVE THE MOUTH, AND COURSE OF THE INTESTINE 



