166 



PLATHELMINTHES 



P. torva M. Schultze (Fig. 265). Body 13 mm. long or less; head 

 rounded in front and not wider than the body; color brown or black: 

 eastern and central states; Europe. 



P. gonocephala Duges (Fig. 266). Body 25 mm. long or less; head 



Fig. 265 



Fig. 266 



Fig. 267 



Fig. 265 Planaria torva (Bohmig). Fig. 266 Planaria gonocephala (Wood worth). 

 Fig. 267 Planaria lugubris (Bohmig). 



as in P. maculata; body with parallel edges as far back as the genital 

 pore; color brown or greenish: eastern states; Europe. 



P. lugubris Schmidt (Fig. 267). Body 20 mm. long or less; head 

 somewhat wider than body, rounded or bluntly triangular; color light 

 brown to black; ductus ejaculatorius receives the secretion of numerous 

 glands which appear on its inner surface : eastern 

 and central states; Europe. 



P. simplissima Curtis. Body 8 mm. long or 

 less, black in color; head end blunt, without lat- 

 eral projections; pigment wanting over eyes; 

 testes few, 4 to 5 on a side: eastern states. 



P. dortocephala Woodworth (Fig. 268). Body 

 elongate, 15 mm. or more long, with acute angular 

 front end and a pair of acute angular auricles; 

 color brown : Illinois ; common. 



P. morgani Stevens and Boring. Body 10 

 mm. or more long, with a rounded or truncated 

 front end, colorless: eastern states. 



2. DENDROCffiLUM CErsted. Body elongate 

 and flat with a truncated head end which bears a 

 large sucker and a pointed tail end; head set off 

 by a slight constriction from the body and with ia 

 pair of short, rounded, lateral projections; mouth near the middle: 

 several species. 



D. gram Wilhelmi (formerly called D. lacteum 0. F. Muller) (Fig. 

 269). Body 10 to 26 mm. long and 3 mm. wide or less, milk white in color 

 with the dark-colored intestine showing through; ventral sucker at front 

 end ; 2 eyes and frequently 1 to 6 accessory eye spots present : eastern states. 



v 



9 



I 

 f 



Fig. 268 



Fig. 269 



Fig. 268 



Planaria dortocephala 

 (Woodworth). 



Fig. 269 



Dendroccelum graffl 

 (Woodworth). 



