IÓ2 



I. IJIMA AND T. KABUKAKI. 



of the duct. Intromittcnt part of penis conical, massive, nearly horizontal. 

 Ovaries two, placed ventrally between second and third gut branches. 

 Oviducts open separately into the outer end of the rather wide vaginal 

 canal, not directly into atrium. Receptaculum seminis moderately large, 

 situated in front of penis. 



Localities : — Under sunken objects in running as well as stagnant 

 waters in various parts of Hondo. This species, which is also known from 

 Europe and North America, is the commonest and the most widely dis- 

 tributed freshwater planarian in Japan. 



7. Planaria papilliferum n. sp. 



Woodcuts 14 and 15. 

 Frontal margin subtruncate, weakly crenate ; lateral lobes rounded, 

 not produced into tentacles. Head indistinctly marked off from trunk by a 



slight neck-like constriction. Trunk 

 slender, nearly uniformly broad down 

 to about the region of copulatory 

 organs, then gradually tapering to the 

 rounded hind end. Characteristic is 

 the presence of a linear series of small, 

 low and truncate papillae in the mid- 

 dorsal line. The papillae number 2c- 

 25 in all ; epidermis on them thickly 

 set with rhabdites. The series of 

 papillae commences sometimes in front 

 of, and at other times behind, the eyes. 



Dimensions of largest specimens 

 in the creeping state : 7—8 mm. long 

 and 1-1 ^ mm. broad. Ratio of breadth 

 to length I : 6-7. 



General color of dorsal surface 

 in the larger specimens somewhat 



14 15 



14. Planaria fapillifera, n. sp. in the creep- 

 ing state. Dorsal papillae indicated by 

 dots in the median line. gX. 



15. Same. Diagram of sexual organs. 

 Index letters as in woodcuts 2, 4 and 8. 



