MOLLTJSCA. 17 



base ; whorls seven, closely wound ; the last scarcely, if at all, broader than the previous one, 

 more or less subangulate at the periphery : base convex, distinctly excavated round a deep 

 narrow umbilicus ; aperture very shallow, the outer margin distinctly thickened, slightly 

 subangulate in the middle ; columella very slightly reflected, oblique, evenly rounded, without 

 any angulation at the base, in this character resembling N. splendens and differing from 

 N. prona. I know of no Indian species like this interesting little shell ; in shape it somewhat 

 resembles the smooth N. woodicma. Diam. 11J, alt. 5|, axis 4| ; apert. lat. 5^ mm. 



Dr. Stoliczka found a few specimens alive at Sonamarg ; he notes that the animal is 

 provided with a mucous pore. 



8. NANINA (MACROCHLAMYS) PRONA, n. sp. 



Shell small, of the same group as N. petrosa, Hutt., &c., but with closer wound whorls ; 

 it is a form which apparently is widely spread throughout the North- Western Himalayas, as 

 the Museum possesses numerous specimens from Simla, Masuri, Naini Tal and Saharanpur ; 

 two specimens, found by Colonel Godwin- Austen in the Daffla Hills, also apparently belong 

 here. A very similar small form, but I think specifically distinct, is also found in the Bombay 

 Presidency. Dr. Stoliczka's specimens from Murree are all young, or in bad preservation ; 

 I have therefore determined on not naming the species from his Murree specimens, but take 

 as my type the common North- West Himalayan form, the animal of which is known and 

 which is usually recorded in collections as N. petrosa. Colonel Godwin- Austen informs me 

 that Hutton himself transferred his own name petrosa from the Mirzapur shell to the 

 Masuri one, on the strength of Benson's statement that the former was identical with the 

 Calcutta N. vitrinoides, in which, as already stated, Benson was quite wrong. This 

 species is not figured in the " Conchologia Indica," as far as I can see. Whorls six, closely 

 wound, the last only slightly deflected, sometimes not at all, in which case, of course, the 

 aperture is quite vertical ; spire almost or quite flat ; periphery rounded ; umbilicus resembling 

 that of N. petrosa, more open than in all the other allied species ; horny-brown colour, smooth 

 and polished above and below ; margins of aperture distinctly, but slightly thickened. Type 

 from Naini Tal : diam. 12, axis 4J, alt. 5^ ; apert. lat. 6, alt. 4| mm. 



9. NANINA (BENSONIA) MONTICOLA, Hutt., var. MURRIENSIS, nov. 



Nanina monlicola, Hutt., J. A. S. B., vii, 1838, p. 215 (North-Western Himalayas). 

 Helix labiata, Pfr., P. Z. S., 1845, p. 65 (Loc. ? ) 



Both species are recorded and figured in the " Conchologia Indica" as distinct, and I think 

 very possibly the two forms there given may prove separable. Unfortunately, typical N. 

 monticola is typical N. labiata, as figured 1. c., pi. xxvii, fig. 5. This I am able to prove by 

 a fine series of typical N. monticola, presented years ago by Captain Hutton to the 

 Asiatic Society, and now in the Indian Museum. Theobald correctly unites the two species in 

 his catalogue, though I consider him mistaken in also uniting Reeve's H. convexa. The form 

 found by Dr. Stoliczka is near the much rarer one figured in the " Conchologia Indica," 

 pi. lii, fig. 3, as H. monticola, and may prove distinct ; the Murree specimen differs indeed, even 

 more markedly than the one there figured, in the characters which separate it from the type 



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