igig.] N. Annandai.e : Bombay Streams Fauna. 149 



Crcmnoconchus syhadrensis (Blanford). 

 (Plate IV, figs. 2-4). 



Two types of shells occur in a large series from the cliffs at 

 Khandalla. The commoner of these agrees well with Blanford 's 

 figure (op. cit., 1863, pi. iv), but in a few specimens the upper 

 surface of the body-whorl is flattened and grooved much as in the 

 same author's var. canaliculatus of C. conicus. 



We have nothing to add to Blanford's description of the 

 external characters, but his account of the branchial chamber is 

 incorrect. As shown in fig. 3, a well developed gill is present. 

 The orifice of the chamber bears a certain resemblance to that of 

 the Pulmonates and can be completely closed. It appears, how- 

 ever, that the cavity is always filled with water and not air (see 

 p. 119), and the roof is not highly vascular. 



The radula (fig. 4, pi. iv) is that of a typical Littorinid. It 

 is very long and narrow, but the tooth-formula is in our opinion 

 I. 2. I. 2. I. All the denticulations are very broad and rather 

 blunt. 



Khandalla appears to be the original locality of this species, 

 and Blanford states that it is only found in the Western Ghats, 

 in the neighbourhood of Bom.bay. 



Family Ampullaridae. 

 Genus Ampullaria, Lamarck, 

 Only a single species is represented in the collection. 



AmpuIIaria nux, Reeve. 

 (Plate V, fig. 8). 



1S56. AmpuIIaria mix, Reeve, Con. Icon., X, AmpuIIaria, pi. xxviii, 

 fig's. 132a, b. 



Reeve in describing this species noted the peculiar develop- 

 ment of the columellar callus, which forms a flat ridge nearly 2 mm. 

 in diameter. This and the small size of the shell are probably 

 correlated with the unusual habitat, for A. nux, unlike any other 

 species of the genus with which we are acquainted, inhabits small 

 mountain streamlets, in which it is important for it to be able to 

 cling as tightly as possible to smooth rocks in rapid-running water. 

 A single living specimen was obtained on the hill above Khandalla ; 

 it was clinging to the rocky margin of a small pool immediately 

 below a waterfall. Numerous more or less broken shells were 

 observed in the same streamlets. We figure the radular teeth of 

 this specimen (fig. 8). 



The operculum is long, rather narrow (r3'3 mm. long by 8 5 

 mm. in a shell with the apex eroded 21 mm. long), thin and slightly 

 transluscent. The inner margin is practically straight, the outer 

 margin strongly convex ; its horny epidermis is thin and of a 



