BALI A. 167 



striate in the line of growth ; periphery rounded but somewhat 

 compressed; epidermis thin; whorls 5I-, moderately rounded, 

 the last three of nearly equal breadth ; spire produced, apex 

 very abrupt and obtuse ; suture deep ; mouth like that of the 

 last species, but with an inward curvature or sinuosity towards 

 the centre of the outer Hp, toothless ; outer lip white, reflected ; 

 umbilicus narrow, oblique. 



Inhabits hill sides, under stones. The following 

 are the only localities in Great Britain where it has 

 hitherto been noticed, but it probably occurs in many 

 other places, and has been overlooked in consequence 

 of its extreme minuteness. Skye (Macaskill), Bal- 

 marino, Fifeshire (Chalmers), Arthur's Seat, Edin- 

 burgh (E. Forbes), Sunderland, South Hylton on 

 the Wear, and Pontefract on magnesian limestone 

 (Howse), Went Vale, Yorkshire (Ashford), Durdham 

 Downs near Bristol, and Lulworth in Dorsetshire 

 (J. G. J.), Undercliff, Isle of Wight (More), B.C. 



This tiny mollusc is sluggish and irritable, and 

 when on the move carries its shell in a perpendicular 

 position. It secretes an abundance of slime. 



Gwyn Jeffreys says that foreign specimens are often 

 provided with a tooth on the base of the penultimate 

 whorl, and another inside the outer lip ; he found one 

 in Switzerland which had three teeth " arranged tri- 

 angularly." 



GENUS VIII.—BA'LIA* {BALEA), PRIDE AUX, 

 Body capable of being entirely contained within the shell ; 

 tentacles 4 ; foot broadish. 



Shell sinistral, elongated, thin ; spire produced ; mouth ovate, 

 or somewhat quadrate, occasionally provided with a denticle on 

 the base of the penultimate whorl ; umbilicus narrow. 



* Striped. 



