150 Records of the Indian Museum. [Vol. XVT, 



brownish colour ; the nacre outside the muscular scar is tinged 

 with lilac. The sculpture of the scar somewhat resembles that on 

 the operculum of A. winkleyi (Pilsbry),' being concentrically striate 

 on the columellar side. 



Hanley and Theobald record this species from Bhor Ghat, 

 which is within two miles of Khandalla ; we have seen a series of 

 dead shells from a small stream at Igatpuri in the Nasik district. 



Family Unionidae. 



A large number of fish, belonging to several distinct species, 

 from the Limnocnida pool at Medha were found to have glochidia 

 of this family embedded in their fins. Unfortunately in the 

 present state of our knowledge it is not possible, except in a few 

 cases recently dealt with by one of the present authors, to identify 

 larval Indian Unionidae. 



Genus Parreyssia, Simpson. 



This genus is represented in our collection by two species from 

 Medha, one of them a common form, the other apparently new. 



Parreyssia cylindrica, sp. nov. 

 (Plate IV, figs. 6, 7). 



A small species closely allied to P. favidens (Benson), but 

 with a much broader and lower shell than an^^ of the varieties of 

 the latter. 



Shell moderately small and thick, transverse-ovate, sub-cylin- 

 drical, with the umbo rounded and by no means prominent in un- 

 worn shells ; dorsal margin nearly straight, anterior margin broadly 

 rounded. Umbonal region sculptured with numerous low corrugated 

 ridges which tend to run together to form V-shaped prominences; 

 towards the posterior margin of the shell these ridges are transverse 

 and curved ; they extend downwards in a more or less distinct 

 fashion, and even in old shells can be traced almost to the lower 

 margin. Periostracum coarse, irregularly striate transversely, of a 

 brownish colour, darker in older shells than in young ones, not at 

 all polished. Nacre with a strong rosy- pink tinge. Hinges much 

 as in P. favidens but less strongly developed. Pseudocardinal 

 teeth prominent, strongly ridged, divided on both valves by a 

 deep groove which slopes forwards and downwards. Lateral teeth 

 slender but prominent, of considerable length, oblique, slighth" 

 arched; two on each valve, a vestigial tooth present in the form 

 of a low ridge below the anterior part of the main lateral tooth on 

 the right valve. Muscular impressions strongly developed, oval or 

 sub-circular. 



1 Pi'oc. Acad. Nat. .Sci. Philadelphia. 1,111, p. i8(), pi. v, tigs. 2, 3 (1901 ). 



