SYAMA, 155 



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 4|, alt. 5 j ; 

 apert. lat. 6, alt. 4| mm." 



I am inclined to think that Nevill did not confine himself when 

 writing the above description to a single shell ; he had numerous 

 specimens before him from various places and was at the time 

 working out Dr. Stoliczka's collection made at Murree, finally 

 determining a shell from that place as prona. 



I have recently obtained from Naini Tal (N. Annandale) 

 specimens of exactly the same diameter as Nevill's type. The 

 axis is the same, viz. 4*5 mm., but the difference between that 

 and the height of the shell is as much as 1*25 mm., clearly 

 showing that the specimen was on spire not " almost or quite 

 flat," which applies exactly to the Simla form, of which I have 

 9 examples to refer to. 



Description of a shell of this species from Kicliha, Naini Tal : 

 Shell depressedly conoid, solid, shiny, rather closely umbilicated ; 

 sculpture quite smooth, with fine transverse lines of growth ; 

 colour rich ruddy brown ; spire flatly conoid, apex blunt ; suture 

 well impressed ; whorls 5 j, well rounded on periphery, gradually 

 increasing, rather closely wound ; aperture lunate, nearly vertical 

 (indication of an earlier aperture is marked by a pale band); 

 peristome somewhat thickened, basal margin scarcely sinuate ; 

 columellar margin suboblique, very slightly reflected. 



Size (largest specimen) : major diam. 12-25, min. 10-8 ; alt. axis 

 5'0, height 6'75 mm. 



Animal with lobe over the mucous pore, very dark grey both on 

 foot and dorsal lobes. Both right and left shell-lobes present, 

 but short ; visceral sac darker ; renal organ ochre, ochraceous on 

 sole of foot. Generative organs : a coiled caecum, to which is 

 attached the retractor muscle ; a very long kale-sac ; no amatorial 

 organ. 



Central teeth tricuspid ; admedian teeth elongate, narrow, with 

 cusp on outer side ; the 12 first marginals bicuspid, the outer cusp 

 low down, the next 18 aculeate, and the outer marginals very 

 small. Formula : 30 . 2 . 10 . 1 . 10 . 2 . 30.] 



[241. Syama prona, var. huttoni, Godwin-Austen. 



Shell well perforate, depressed, almost discoid, base flat, rather 

 strong; sculpture quite smooth; colour light tawny or light 

 brown ; spire scarcely raised above the last whorl, apex rounded ; 

 suture impressed; whorls 5, regularly increasing, somewhat closely 

 wound, rounded on the periphery ; aperture flatly lunate, nearly 

 vertical ; peristome thin, basal margin slightly sinuate ; columellar 

 margin oblique, hardly reflected. 



Size : major diam. 13-75, minor 12-0 ; alt. axis 4'75, height 

 6-5 mm. 



