166 



PLATHELMINTHES 



P. torva M. Scluiltze (Fig-. 2G5). Body 13 mm. long or less; head 

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

 eastern and central states; Europe. 



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



9 



Fig. 265 



Fig. 266 



Fig. 267 



Fig. 265 — Planaria torva (Bohraig). Fig. 266 — Planaria gonocephala (Woodworth). 

 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 



^ff\ 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. Dendroc(ELTJM 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 a 

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

 several species. 



D. graffi Wilhelmi (formerly called D. lacteum 0. F. Miiller) (Fig. 

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

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

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



Fig. 268 



Fig. 269 



Fig. 26S 



Planaria dortocephala 



(Woodworth). 



Fig. 269 



Dendroealum graffi 



(Woodworth). 



