Intestine with three branches, one median anterior and two lateral pos' 

 terior; usually small but not as minute as the preceding — Order Tri' 

 cladida 2. 



2. Land animals — The Diploneura (Terricola) Land Turbellaria 3. 

 Water animals — The Haploneura (including the Paludicola) Larger 



Water Turbellaria 7. 



3. Body ribbon'like, with the head suddenly wider than the body; getting to 



be several inches long; found in greenhouses 



Bipalium \ewense Moseley Ribbon Worm 

 (Placocephalns \ewense (Moseley) ) 

 Animal tapered at each end; smaller 4. 



4. With many eyes in linear arrangement around the anterior margin and 



back along the sides; getting to be an inch or more long; Cal. into 

 Mexico 



Geoplana mexicana Hyman 

 With a pair of eyes anteriorly, or eyes apparently absent; less than an inch 

 long 5. 



5. First fifth of animal narrower and more cylindrical than the rest; usually 



lengthwise striped; reported from Pa. and Ohio 

 Rhynchodemus sylvaticus (Leidy) 

 Animal more evenly tapering at each end; more uniformly grayish 6. 



6. Eyes apparently absent; W. Va. to Maryland 



Diporodemus mdigenns Hyman 

 Eyes more apparent; Ky to Mo. 



Geodesmus atrocyanens (Walton) 

 (Rhynchodemus atrocyaneus (Walton) ) 



7. With many eyes in an inverted U-shaped arrangement around the front 



and sides of the head region; found in the southwest 

 PolyceUs coronata (Girard) 

 Eyes none to several in pairs or in two lengthwise rows 8. 



8. No eyes; color white; cave species 9. 

 With eyes; color various 13. 



9. With many pharynxes; Indiana 



Phagocata suhterranea Hyman 

 With one pharynx from the middle of the ventral surface 10. 



10. With pointed head lobes; Kentucky 



Sphalloplana percoeca (Packard) 

 (Dendrocoelum percoecum Packard) 

 Head lobes obscure or absent 11. 



11. Animal turtle-shaped, with a snout about one-fourth as long as the body; 



small (about one-eighth of an inch long) ; Oregon 

 Ken\ia rhynchida Hyman 

 Animal flattened, elongate, tapering posteriorly; larger 12. 



12. With a short snout visible only when the animal is contracted; Penn. 



Speophila pricei Hyman ,. 



No snout; Kentucky <5^,CJ\|f^<.1 ?X 



Speophila huchanani Hyman ^' r- - '^^ 



13. Anterior end truncate 14. 



83 



