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 slightly 

 conical : foot not fringed, rather broad, rounded in front and 

 behind. 



SHELL subcylindrical or inclined to oval, rather thin and 

 semitransparent, glossy and slightly iridescent, yellowish- 

 brown or horncolour, closely but slightly and irregularly 

 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 two-fifths of the shell 

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

 formed whorls much smaller in proportion to the rest : spire 

 short, abruptly and bluntly pointed : suture rather oblique, 

 well defined, but not deep : mouth subtriangular, 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 which nearly corresponds with 

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

 transverse plates like those in the last species : outer lip 

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

 thickened and considerably reflected : pillar lip also white 

 and thickened, almost straight : inner lip spread on the 

 pillar : umbilicus 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. edentula. Columellar tooth wanting. 



Var. 2. alba. 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 

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



2A 



