ig2i.] T. Kaburaki : Notes on Leeches. 695 



The mouth is situated near the centre of the anterior sucker. 

 Extending over about three somites, vii-ix, is the pharynx, which 

 is of a cyhndrical shape. The crop is provided with some ten 

 pairs of subdivided lateral diverticula, one pair in each of somites 

 x-xix. The last pair are reflected posteriorly, giving off four sec- 

 ondary, outwardly directed diverticula. The stomach bears four 

 pairs of lateral pouches which lie within the three somites xx-xxii. 

 Opening on the dorsal surface is the anus, which occurs between 

 the last two somites. 



The male genital orifice, though I could not find it out defi- 

 nitely, seems to lie between somites xi and xii, and the female ori- 

 fice is two rings behind the male, that is between the second and 

 third rings of somite xii. 



Genus Glossosiphonia, Johnson. 



8. Glossosiphonia weberi, R. Blanchard, 1897. 



(Text-fig. I.) 



The material was found at the north end of Lake Loktak, 

 Manipur, adhering to the body of Vivipara oxytropis (Benson). 



On examination, the species, though exhibiting a small differ- 

 ence in the position of the genital orifice, proves to be identical 

 with Blanchard's Glossosiphonia weberi from Sumatra described by 

 that author. Gl. wehcri is very closeh^ related to CA. hctcroclita 

 (Linn.) which is of wide distribution in Europe and America, but 

 it is distinguishable from it bj' the possession of numerous well- 

 developed papillae on the dorsal surface. 



The body is generally of small size, in a full grown condition 

 being 8 mm. long, exclusive of the posterior sucker, by 4 mm. 

 across at the middle. In the preserved state the body as seen in 

 dorsal aspect is ovate-elliptical in form, broadest slightly behind 

 the middle, and thence tapering more gradually to the anterior 

 than to the posterior end. The dorsal surface is much arched 

 and quite rough all over, owing to the presence of numerous well- 

 developed conical papillae, while the ventral surface is nearly 

 flat and entirely smooth. The anterior sucker, as in all species of 

 Glossosiphonia, lies on the ventral side of the head, within the 

 limits of rings 1-3. The mouth is situated slightly anterior to 

 the eyes, well forward in the anterior half of the said sucker. The 

 posterior sucker is sometimes ventral in position and of a small 

 ovate or circular shape, the diameter being about i mm. 



The external rings are rather conspicuous; counting dorsalh^, 

 so far as my observation goes, there are seventy in front of the pos- 

 terior sucker, of which the preocular rings are in most cases five in 

 number, and rings 5 and 6 coalesce on the ventral surface, forming 

 the posterior margin of the anterior sucker. Blanchard speaks 

 of there behig four preocular rings in the Sumatran form, but 

 the number, as Castle (1905a) has pointed out, is not constant in 

 the case of Gl. heleroclita, and no doubt varies to some extent in 



