THE PHYLUM PLATYHELMINTHES 205 



N^ 



"Brain 



7^ Eye 

 Y Sensory lobe 





' Ventrolatera.1 



\ Intestine 



■ Pharynx 



' Mouth cavity 



■ Mouth 



Figure 11.1. Dugesia. Dorsal view, showing the digestive and nervous systems. The 

 mouth opens ventrally. (After Hyman.) 



s^K 



s^^sS^kml■mmmkmkmm>.,.,mmgg 





.»>.;..^v^uw.^>.v; WM^ m;w^!J)jj;)s 



xsxs-s^.kk-.u-m'.'.'W'ji.'mki! 



.^e^-,^ 



<SS»ww^U.xT?;v.wi.i„Mwi.'.' 



.v,-.^VA'A- 



Figure 11.2. Hunting and feeding in Dugesia. A small crustacean (Daphnia) is cap- 

 tured and eaten, its tough exoskeleton remaining as an empty shell. 



