ig2i.] T. Kaburaki : Notes on Leeches. 709 



passages. The openings lie twenty rings behind the male genital 

 orifice. 



The anus lies on the dorsal surface between somites xxv and 

 xxvi. 



The clitellum embraces four somites, x-xiii. 



In spite of the existence of a dorsally situated opening of 

 the digestive tract, this leech may be distinguished from Trematob- 

 della by the difference in the number and arrangement of rings 

 composing the typical somite ; in this respect it seems to be 

 somewhat related to Miniobdella. To me it appears to represent 

 a new genus of the Herpobdellidae. 



Genus Scaptobdella, R. Blanchard. 

 19. Scaptobdella horsti, R. Blanchard, 1897. 



I refer five specimens from Java to Blanchard' s Scaptobdella 

 horsti which is known to occur also in Sumatra and Borneo. The 

 present material was found at an elevation as high as about 4700- 

 6500 ft. in Tjibodas. 



The body, presenting some resem.blance in its external feature 

 to the earth worm, is soft, smooth on the whole and oval or 

 circular in cross section, its anterior end being narrower than the 

 rounded posterior end. The lateral sides of the body are nearly 

 parallel for the greater part of its length. The posterior sucker 

 is in the form of a shallow circular disc with a diameter rather 

 less than the breadth of the body. All the specimens are of 

 nearly similar size, about 175 mm. long, exclusive of the posterior 

 sucker, by 12 mm. across. 



The ground colour, though faded in spirit for the most part, 

 is dark olive without any trace of markings. 



The complete somite is formed of six rings, of which the 

 first two rings are broadest, in most instances being divided trans- 

 versely by a superficial furrow into primitive rings. On some 

 occasions, especially in the hind region of the body, the same 

 subdivision is to be found on the other narrower rings of each 

 typical somite, excepting the fifth ring. 



No trace of visual organs has been detected in the present 

 species. 



The male genital orifice lies 'oetween the third and fourth 

 rings of somite xi, and the female orifice is six rings behind the 

 the male, that is on the third ring of somite xii. In one case 

 there is found a minute aperture at the dorso-lateral edge of the 

 ring just behind that bearing the female orifice. 



The anus is placed on the dorsal surface just in front of the 

 last three rings of the body. 



The clitellum embraces twenty-one rings, as described by 

 R. Blanchard, extending from the second ring of somite x to the 

 first ring of somite xiii. 



