PUPA. 247 



brown with a dusky shade above, and of a paler hue on the 

 sides and rear, as well as underneath ; head and neck marked 

 with black specks, which are arranged in confused rows: 

 mantle annular or circular, minutely speckled with black and 

 milk-white: tentacles slightly transparent; upper pair close 

 together and nearly cylindrical, with large pear-shaped bulbs, 

 forming one-fourth of these tentacles; lower pair widely 

 separate from each other, very thick and sHghtly conical : foot 

 not fringed, rather broad, rounded in front and behind. 



Shell subcylindrical or inclined to oval, rather thin "and 

 semitransparent, glossy and shghtly iridescent, yellowish - 

 brown or horncolour, closely but slightly and irregularty 

 striate in the line of growth : periphery rounded, or sometimes 

 very slightly and obtusely keeled: epidermis thin: whorls 

 6-7, convex, the last equal to about tv,^o-fifths of the shell 

 and sharply twisted upwards towards the mouth, the two iirst- 

 formed whorls much smaller in proportion to the rest : spire 

 short, abruptly and bluntly pointed: suture rather oblique, 

 well defined, but not deep : mouth sub triangular, contracted or 

 channeled below in the adult, furnished with a small and 

 short tooth-like ridge on the pillar near the insertion of the 

 outer lip (where it bends to form a junction with the lip), as 

 well as with a short and oblique ridge-like tooth on the pillar 

 lip ; young shells have a spiral screw on the pillar and another 

 on the pillar lip, the position of wliich nearly corresponds with 

 that of the ridge and tooth in the adult, and they have also 

 transverse plates hke those in the last species : outer lip white, 

 with sometimes a slight tinge of reddish-brown, much thick- 

 ened and considerably reflected: pillar lip also white and 

 thickened, almost straight : inner lip spread on the piUar : 

 umhilicus very small and oblique, contracted by a ridge or 

 crest at the base of the shell, which arises from the abrupt 

 and upward twist of the lower part of the body whorl. 

 L. 0-15. B. 0-075. 



Yar. 1. edentida. Columellar tooth wanting. 



Yar. 2. alha. Shell white or colourless. 



Habitat : On old walls and rocks, under stones, 

 among dead leaves and beneath the bark of trees every- 

 where, from Zetland to the Channel Isles. It inhabits 

 hiffh as well as low situations. The first variety is not 

 uncommon. The second has been found by Mr. Norman 



