116 THE LAtfD AtfD FRESHWATER AtOLLtfSCA Of DORSETSHIRE. 



20. H. LAPICIDA, Linn., pi. 8. 



Pult. cat., p. 46. Rack, ed., p. 52, pi. 20, fig. 9. 



Body yellowish-brown above, slightly reddish in front,grey behind 

 and beneath. 



Shell depressed, thin, very solid, shagreened, almost opaque, red- 

 dish horn-colour, irregularly streaked across the whorls with 

 darker tints of the same colour ; periphery sharply keled ; whorls 

 five, the last exceeding the rest of the shell in size, dilated towards 

 the mouth, which is obliquely oval, angular above and below ; outer 

 lip white, thickened and reflected ; umbilicus rather large. L.0.25. 

 B.0.65. 



Hab. Rocks, walls, woods. Generally distributed. Quater- 

 nary tufaceous deposit, BlashenweH. 



Genus T.BULIMTTS, Scopoli. 



This genus differs very slightly from Helix, the tentacles are 

 shorter, and the shell more prolonged at the spire ; there is a 

 difference too in the structure of the lower jaw, which is desti- 

 tute of teeth, and in the arrangement of the generative organs. 

 Their habits are similar to those of Helix, hiding themselves 

 under stones, grass, moss, dead leaves, &c. 



1. BULTMUS ACUTUS, Miiller 9 pi. 9. 



F. and H., vol. iv., p. 86, pi. cxxviii., f. 5. 



HELIX BIFASCIATA, Pult. cat., p. 49. Rack, ed., p. 55, pi. 18, 



fig. 8, 10. Maton and Rackett, Trans. Linn. 



Soc., vol. viii., p. 210. 



Body short and thick, narrow and truncate in front, slender and 

 pointed behind; yellowish-grey, with darker tints towards the 

 neck and beneath. 



Shell turreted, with large and rather roughly grooved longitu- 

 dinal striae, almost opaque, whitish or greyish, with one or two 

 brown bands, continuous or interrupted, sometimes extending: to 

 the upper whorls ; periphery round, not keeled ; whorls eight to 

 nine, convex, gradually increasing in size, the last occupying about 

 one-third of the shell; spire tapering and blunt; mouth oval; 

 umbilicus narrow, partly concealed by the pillar lip. L.UO. B.O.i'. 



Hab. Downs and sandhills near the sea, Lulworth Cove 

 (Maton and Rack.) ; abundant on the waste lands of Dorset- 

 shire (on Chalk, Purbeck and Portland stone) (Forbes and 



