7o8 



Records of the Indian Museuvi. [Vol. XXII, 



of the body. The length of the body is 40 mm. and the breadth 

 about 5 mm. at the middle. 



The dorsal surface is of a black colour, while the ventral 



surface is much lighter than 

 the dorsal, and of an olivace- 

 ous colour. 



The somites, although 

 not traced out definitely 

 may be regarded as being 

 grouped somewhat as fol- 

 lows, — somites i, ii and iii 

 are uniannulate ; iv, xxvi and 

 xxvii biannulate ; v triannu- 

 late ; vi and xxv quadrian- 

 nulate ; the eighteen somites 

 vii-xxiv are complete with 

 seven rings. In each typical 

 somite the first four rings 

 are enlarged and usually 

 divided transversely either 

 superficially or completely, 

 but the remaining three are 

 narrow. In somite v the 

 last two rings are fused on 

 the ventral surface to form 

 the posterior margin of the 

 anterior sucker. The super 

 ficial division is to be seen 

 in the ring corresponding to 

 somite iii, in the first and 

 second rings of somite vi as 

 well as in the first ring of 

 somite xxv. 



There are a pair of eyes 

 which are placed in ring 3. 



The male and female 

 genital orifices are separated 

 by seven rings, being situa- 

 ted respectively just behind 

 the last ring of somites xi 

 and xii. 



Great interest is attach- 

 ed to an external opening 

 of the digestive tract, which occupies a position on the mid-dorsal 

 surface, as is the case with Trematobdella perspicax (R. Blanchard). 

 So far as my observation goes, it seems to lie between the fifth and 

 sixth rings of somite xiv. Such a peculiar opening of the diges- 

 tive tract is also known to occur in Horst's Ncphelis dtibia 

 from Sumatra, described by that author, in which the tract opens 

 to the exterior on the ventral surface by a pair of slender 



XXI Y 



JOV 



XXVI-XXVIT 



Text-fig. 6. — Foraminobdella heptamer- 

 ata, gen. et sp. nov. 



Diaorammatic representation of the ante- 

 rior and posterior extremities ; dorsal as- 

 pect. 0., dorsal opening of digestive tract. 



