66 helicidjE. 



enlarging; the last suddenly deflected near the aperture; 

 apex blunt. Aperture somewhat oval, much broader than 

 high, occupying about three- sevenths of the total diameter. 

 Peristome white, united, not appressed upon the body, 

 slightly notched by the termination of the keel, below 

 which it is arcuated, retiring, reflected, and a little thick- 

 ened. Base most prominent immediately around the deep 

 and widely open umbilicus, thence sloping to the carina. 



The diameter is usually three-quarters of an inch. 



The animal is of a general dusky hue, with dark brown 

 stripes running along the neck and on to the tentacula, 

 both upper and lower. The sides of the foot are pale 

 brown or greenish. The tail is slender, but rather obtuse, 

 and scarcely extends beyond the shell. 



This very peculiar snail is locally distributed in Eng- 

 land, and to be sought for in limestone and chalky 

 districts. It occurs abundantly in the south-eastern coun- 

 ties, and in Derbyshire. It is not found either in Ireland 

 or Scotland. It ranges northwards to Sweden, and south- 

 wards to the Pyrenees. 



H. rufescens, Pennant. 



Depressed, bald, rufous, subangulated and whitish at the peri- 

 phery ; outer lip remotely edged with white internally ; umbili- 

 cus moderately large. 



Plate CXVIII. fig. 4,7. 



landestina, Born, Mas. Crcs. Vind. (teste Hartmann). 

 ., rufescens, Penn. Brit. Zool. ed. 4, vol. iv. p. 134, pi. 85, f. 127 (badly). 

 — Da Costa, Brit. Conch, p. 80, pi. 4, f. 6. — Pulteney, 

 Hutchina, Hist. Dorset, p. 47. — Mont. Test. Brit. p. 420 

 (not young), pi. 23, outer f. 2. — Donov. Brit. Shells, vol. v. 

 pi. 157, f. 1. — MATON and Rack. Trans. Linn. Soc. vol. viii. 

 p. 196 (not young). — Dorset Catalog, p. 53, pi. 20, f. 6. — 

 TriiT. Conch. Diction, p. 52 (not young). — Jeffreys, 



