514 Memoirs of the Indian Museum. [Vol. V, 



(g) "RambhaBay. Among weeds." 

 (A) "Station 51. 5-7 mi. B. by N. of Patsahanipur." 

 (i) "Station 64. Ghiakhala headland and neighbouring islands." 

 (j) "Station 73. 7-4 mi. E.|S. of Patsahanipur. On Hypolophus sephen (Forsk.)" 

 {k) "Station 54. 2 mi. N.E. by N.|N. of Kalidai. 

 (I) "Off Barkul. From Chatoessus chacunda." 



[A leech apparently identical with Piscicola olivacea is very abundant among 

 algae on the shore of Barkuda Island, Chilka L,ake, and I have also obtained 

 specimens from a small pool of almost fresh water on the same island. In this pool 

 the only vertebrates were frogs (Rana cyanophlyctis) . — TV. A .] 



Additions to this preliminary description of P. olivacea will, it is hoped, appear 

 at a later date. 



N.B. — Along with the examples of P. olivacea were several specimens of another and 

 apparently new species of leech closely resembling the former in size and form, 

 without eyes and having at least fourteen rings to the complete somite. I give 

 here Dr. Annandale's notes upon it, and it is doubtful if the material will yield 

 much more information ; the muscular expansion of the margins of the body giving 

 the fin-like appearance described below is not evident after death. 



" Leeches on lips of Hypolophus sephen (Forsk.) .. attached outside, close to 

 junction of skin and teeth on both upper and lower jaws. No visible eye spots. 

 Specimens seem to have a lateral fin on anterior two- thirds of body. Colour whitish 



Occasionally minute spots of faint pink on dorsal surface." Collected at 

 "Station 43. 8 mi. S. S.W. of Kalidai, Chilka Lake. Sp. gravity of water 1-007 — 

 1*011. " 



Placobdella emydae, n. sp. 

 (Fig. 2). 

 External Features — Form, Suckers, Annuli, Somites, Eyes. 



Body flattened, in extension elliptic-lanceolate, with the head region slightly 

 dilated. 



Dorsal surface with a roughened appearance due to the presence on each 

 annulus of numerous small papillae. 



Ventral surface without papillae and smooth. 



The dorsal papillae vary in size and arrangement. A row of about 16-20 papillae 

 are present on the first and third ring of the complete somite, whilst about twelve are 

 more regularly disposed upon the middle ring. The middle ring of the somite (which 

 lodges a ganglion of the ventral chain) has, amongst the others, three pairs of meta- 

 meric papillae ; a paramedian, an intermediate and a paramarginal pair, the inter- 

 mediate pair being the largest. 

 N.B. — All papillae tend to disappear and may even be absent in improperly preserved 



specimens. 



Anterior sucker pierced on its anterior lip by the mouth- opening ; with a shallow 



