228 HELICID.E. 



dusky, speckled with milk-white: tentacles yqyj long, dark- 

 grey with a slight tinge of yellow ; bulbs very short and glo- 

 bular : foot narrow and rounded in front, broader and keeled 

 behind, its sides having a whitish border. 



Shell depressed above and below, rather solid, nearly opaque, 

 not glossy, yellowish tinted with reddish-brown, and irregu- 

 larly streaked across the whorls with the latter colour, marked 

 with indistinct hues of growth, and finely shagreened, like 

 seal-skin : peripliery strongly and sharply keeled : epidermis 

 rather thick : whorls 5, greatly compressed towards the peri- 

 phery, the last exceeding in size the rest of the shell and some- 

 what dilated towards the mouth : spire Yerj little raised, point 

 blunt : suture rather slight, but distinct : mouth obliquely oval, 

 angnlated above and below, with rather a deep notch in the 

 line of the keeled periphery : outer lip white, thickened and re- 

 flected, forming a complete peristome, abruptly and consider- 

 ably inflected on both sides : umbilicus rather large, exposing 

 a great part of the whorls and all the internal spire. L. 0*25. 

 B. 0-65. 



Var. minor. Shell smaller and more deeply coloured. 



Habitat: Moist rocks, woods, aud other places in 

 many parts of England, from Went Vale, Yorkshire, to 

 Portland Island. This species does not appear to be 

 fomid in Wales, Scotland, or Ireland. It has been sup- 

 posed to be restricted to calcareous districts; but Mr. 

 Reece has found it close to Worcester, and Capt. Bruce 

 Hutton at Linton in North Devon, in neither of which 

 places is there any limestone, chalk, or oolite. In a spe- 

 cimen now before me the whorls are twisted, like the sca- 

 lariform distortion of some kinds of Planorbis. This is 

 one of our upper tertiary fossils. Its foreign range extends 

 from Finland to Portugal; and Aradas and Maggiore 

 are said to have found a single specimen in Catania. 



This is a rather hardy, but inactive snail. During 

 the daytime it lies concealed in the crevices of rocks or 

 old walls and under the bark of trees ; but in the dusk 

 of the evening, or after a shower of rain, it sallies fortli 



