igzi.] T. Kaburaki : Notes on Leeches. Ggr 



17. Nematobdella iiidica, gen. et sp, nov. 



18. Foraminobdclla hcptamerata, gen. et sp. nov. 



19. ScaptobdcUa horsti, R. Blanchard. 



Family GNATHOBDELLIDAE. 



20. Whitmania laevis (Baird). 



21. Limnatis nilotica (Savigny). 



22. Limnatis granulosa (Savigny). 



23. Hacnwpis sangjiisuga (L,innaeus). 



24. Hacmopis bir inanica , R. Blanchard. 



25. Hacmopis concolor, sp. nov. 

 2b. Myxobdclla annandalci, Oki. 



27. Hacinadipsa zcyla)iica (Moquin-Tandon). 



Sub-order Rhynchobdellae. 

 Family ICHTHYOBDELIylDAE. 

 Genus Ozobranchus, de Ouatrefages. 

 I. Ozobranchus jantseanus, Oka, 1912. 



Numerous specimens of a species identical with Oka's Ozo- 

 branchus -jantseanus from China were obtained by Dr. B. L. Chau- 

 dhuri from a Kachnga donghoka in the Zoological Gardens of Cal- 

 cutta, which was originally brought from Oodhua near Rajmahal. 



The body is depressed and formed of two distinct regions, a 

 short narrow neck and a long large abdomen, the former being 

 partly invaginated into the abdominal region, as is the case with 

 Branchclliun. The abdomen is provided with eleven pairs of digi- 

 tate branchiae, of which the anterior are much larger and more 

 branched than the posterior. The anterior sucker is vepy small 

 and not distinct from the neck , while the posterior represents a 

 large cupuliform disc with a diameter about as broad as the abdom- 

 inal part of the body. The large examples are about 25 mm. 

 in length, without the posterior sucker, and 7 mm. across at 

 the middle of the al^domen. 



The complete somite is formed of two rings of different size , 

 the first ring being enlarged and the second narrower. In the ab- 

 dominal, but not in the neck region, each ring, as stated by Oka 

 (1917), is in some cases marked on the dorsal surface with a trans- 

 verse row of papillae beset with more than one sharp point. 



In the preserved specimens the body, though colourless in 

 most instances, is sometimes of a brownish colour, without any 

 trace of markings. 



A pair of eyes lie slightly behind the level of the mouth which 

 opens near the centre of the anterior sucker. 



The male and female genital organs open in common at the 

 base of the neck, where the latter merges into the abdomen. 



The anus is located on the dorsal surface between the last two 

 somites of the bodv. 



