, JAPANESE LAND LEECHES. 279 



for each ; the surface of the rings quite smooth, destitute of any pro- 

 tuberances ; the furrows between the rings distinct but not deep. 



Somites. Number of the ring.s in an unabbreviated somite vari- 

 able, but constant for each species (4, 6, or <S). 



Moiitli-opeiünr) occu])Ying. un the ventral side, a space correspond- 

 infj" to 4-() rinus, at the anterior extremity of the body ; tlie two 

 following- rino-s formino- on the ventral side, the ])o.sterior lip of the 

 mouth. 



Ei/es. Only one pair externally visible, situated always at the 

 anterior margin of the second ring, wide a] tart from each other. A 

 few minute black dots sometimes visible on the 4th or 5th ring. 



MaxiUœ. Entirely wanting. 



Genital Orifices. The male orifice is placed iibout the middle 

 ])oint between the 5th and the 6th ganglia (not counting the oeso- 

 phageal ganglionic mass). The female orifice is situated just in front 

 of the 7th ganglion. The number of rings which intervene between 

 these two orifices variable, but constant in each species. 



CliteUidn occupying a space of three somites' length, /. c, the two 

 somites bearing the genital orifices, a greater portion of the somite 

 preceding them, and a few rings of the somite f)llowing them. 



Nephridial pores opening on the ventral surface of the last ring of 

 the somites. 



Äcetalmlum rather small, ovate, the diameter being less than half 

 the breadth of the animal. 



As I have only alcoholic specimens, now, I am unable to give 

 an exact description of the colour of all these leeches in the living state, 

 but judging from a water-colour drawing made from the fresh object 

 and also from specimens that had been kept (jiily for a short time in 

 alcohol, the following may be said of all three species. The dorsal sur- 

 face is always darker than the ventral. The median line of the dorsal 



