Terrestrial Planarians from Japanese Territories. 43, 



ïlie eye-spots are arranged in one or more rows along the 

 entire margin of the head and continue round to the sides of the 

 neck, where they are somewhat closely packed. Besides this, the 

 eye-spots are present sparsely scattered over the whole length of 

 the body to the very tail. 



The mouth-opening is placed at about the hind end of the 

 first third of the body, leading into the peripharyngeal cavity. 



The genital organs were not yet developed in the specimens 

 examined. 



Family Rhynchodemidae von Graff. 



Genus Kliyuclio«leinus Leidy. 



19. Jthunchotlenius Ijietini, n. sp. 



(PI. I., Figs. 19, 20.— Text fig. 23.) 



Some specimens representing this new species were obtained- 

 by the late Professor Ijima in July, 1886, on the mossy stone w^all 

 under stones in Nikko and its vicinity. 



The body in the living state is nearly circular in cross section, 

 slender, and almost uniformly broad for its greater length, though 

 it tapers more gradually to the rounded or somewhat truncated an- 

 terior extremity than to the posterior, which is bluntly pointed. 

 On the ventral side of the anterior body-part, indistinctly marked 

 ofï from the trunk by a gentle constriction, there is a depression, 

 which is shallow but well-defined and is thrown into a series of 

 wavy folds, lying just in front of the anterior termination of the 

 sole and occupying about one-fifth the whole length of the body. 

 Anteriorly and laterally the depression is bordered by a prominent 

 ridge of a horseshoe shape, while posteriorly it gradually merges 

 into the general ventral surface. Extending almost throughout the 

 whole length of the body, from behind the said ventral depression, 

 is the slightly raised sole, rather less than one-fifth the breadth 

 of the body. In length the specimens range from 8 mm. to 14 

 mm., measuring 1-1-5 mm. in breadth. 



The dorsal surface is of a dark olive-like brown colour, with a 

 dark median zone, which medially encloses a light space nearly in 



