154 ZONITIDJS. 



some other instances may have used the name for different species 

 at different times. [This is much more likely to be a mistake 

 made by Hanley. The first specimens I collected at Mussoorie 

 were named for me by Captain Hutton and are now in the Natural 

 History Museum. Hutton only knew the typical Mussoorie and 

 Simla form ; he had never seen the species from Murree.] 



240. Syama prona, Nevill, Nanina (Macrochlamys), Yark. Miss., Mol. 

 1878, p. 17 ; Godwin-Austen, Mol. Ind. i, 1883, p. 103 (desc. 

 animal), pi. 22, fig. 2 (shell) ; ii, 1898, p. 48 (radula and jaw). 

 Macrochlamys masuriensis, Godwin-Austen, Mol. Ind. i, 1883, p. 94 

 (no description), pi. 21, fig. 8 (sculpture on shell). 



Shell perforate, depressed, almost discoidal, rather solid, light 

 tawny or brown, rather dull, not polished, smooth, with moderately 

 close, fine, regular, longitudinal striae, sometimes more or less 

 papillate ; spire almost flat, suture impressed ; whorls 5-6, flatly 

 convex above, the last whorl rather broader, rounded at the peri- 

 phery, not swollen beneath; aperture nearly vertical, broadly 

 lunate, with very frequently a thickened rib some distance inside 

 the peristome ; the latter is thin, basal margin slightly arcuate, 

 columellar oblique, briefly and narrowly reflected. 



Major diam. 16, min. 14J, height 7 mm. 



Hob. North-western Himalayas. 



Reported from Grarhwal, Naini Tal (typical var.), Mussoorie, 

 Simla, and Tandiani near Murree. Naini Tal specimens are small, 

 only 12 mm. in diameter : the shell of which the dimensions are 

 given above was from Garhwal ; a Mussoorie shell measures 18 x 

 16x7 mm., and has distinctly papillate sculpture (M. masuriensis) ; 

 smaller shells from Simla measure 14 x 12 x 6 mm. and have the 

 sculpture not papillate. 



[Much confusion has been found to be the result of starting 

 with the idea that this species, S. prona, had a range extending 

 from Naini Tal on the east and even further, from the Dafla Hills 

 in Assam (Nevill) westward to Murree. When specimens from 

 the several localities on this range are examined together and 

 placed side by side the variation is so considerable, it is necessary 

 to separate some of these and give them specific rank. 



I have left intact all that Dr. Blanford wrote. His description 

 of prona seems to be a general one ; the precise locality of the 

 shell described is not indicated, and now it is not possible to find 

 the specimen. 



The type of S. prona was from ISTaini Tal. Nevill's original 

 description is as follows : 



" 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 Nanina petrosa, more open than in all 



