i66 
ZOOLOGY OF THE FAR EAST. 
5- Mimobdella japonica, Blanchard (1897). 
Locality. Komatsu, Lake Biwa, 30-100 ft. Oct. 27, 1915. One specimen 
" Among Corhicula. Colour. Dark purple-brown ^ with indistinct cross bars on dorsal 
surface." 
The single specimen measures about 40 mm. in an extended condition, and is 
apparently immature. 
As the original description of this species given by Blanchard was based upon a 
very old specimen collected by Siebold, and is naturally somewhat imperfect, I take 
here the opportunity of supplementing it with a few remarks. 
The colour in life is greenish, reddish or purple-brown, with indistinct pattern 
of darker tint on the dorsal surface, pale reddish ventrally. 
There is a pair of eyes on the second ring placed rather wide apart. When 
mounted in glycerine, four minute pigment dots or rudimentary eyes become visible 
on the fifth ring, which are evidently homologous with the posterior row of eyes of 
Herpobdella. 
Each typical somite consists of three large and four small rings. From the position 
of the nervous ganglion, which lies within one of the larger annuli, it seems very 
probable that the three large rings are the second, third and fourth annuli of the 
originally five-ringed somite, and the four small rings correspond to the first and fifth 
annuli each subdivided into two. Sometimes the second and fourth rings also show 
indications of subdivision, in which case the somite appears as nine-ringed, as given 
by Blanchard. 
The male genital aperture lies in the furrow separating somites XI and XII, the 
female between the fifth and sixth ring of somite XII. Thus, the pores are separated 
by a space corresponding to four annuli of the typical five-ringed somite. 
The clitellum includes twenty-one rings, beginning with the fifth ring of somite 
X and ending with the fourth ring of somite XIII, both inclusive. It will be seen by 
comparison that the extent of the clitellum agrees exactly with that of an ordinary 
Herpobdella. 
6. Scaptobdella blanchardi, Oka (1910). 
Localities, (i) Zeze, under stones near edge of Lake Biwa. Oct. 3, 1915. Six 
specimens. (2) Sta. 13, lower surface of stones at shore of Chikubushima. Oct. 1-3, 
1915. One specimen. 
These are all small specimens, the largest measuring only 32 mm. in length and 
4 mm. in width. They are of a pale greyish colour, and differ in no wise from indivi- 
duals of similar size from other localities. 
Fam. GLOSSIPHONIDAE. 
7. Glossiphonia smaragdina, Oka (1910). 
Locality. Sta. 13, lower surface of stones at shore of Chikubushima. Oct. 1-3, 
1915. One specimen. 
