CLASSES, ORDERS, ETC 85 



several bands below it ; whorls six, convex ; mouth rounded, 

 purplish-brown interiorly ; umbilicus narrow, deep. Height 

 Jfths inch. Downs and sandhills near the coast. Local. 



H. virgata. 



(r) Shell subconical, depressed, whitish or dull yellowish-white, 

 banded with brown, solid ; whorls six, periphery bluntly keeled ; 

 spire slightly raised, with the apex tipped with brown ; mouth 

 roundish, with a strong white internal rib ; umbilicus large. 

 Height -/g-ths inch. Under stones and among grass on sandy 

 .soils. Somewhat local. H. caperata^ 



(s) Shell circular, depressed, greyish or whitish, banded with 

 chestnut-brown ; whorls six, spire slightly raised with a brown 

 apex; periphery not keeled; mouth almost circular; umbilicus 

 large and open, exposing three or four whorls. Height \ths 

 inch. Heaths and downs near the sea. Local. 



H. ericetorum. 15 



(t) Shell depressed, circular, yellowish or reddish, regularly 

 marked with rufous brown; whorls six to seven, outer margin 

 strongly keeled ; spire slightly produced ; mouth crescent-shaped ; 

 umbilicus large and deepish. Height -^-ths inch. Under stones 

 and among decaying leaves. Common. H. rotundata 



(u) Shell sub-conical, depressed below, transverse striae oblique 

 and strong, blackish-brown ; whorls five to six, with the spire 

 somewhat produced ; mouth nearly circular, gibbous ; umbilicus 



73 v. subglobosa, smaller, with a double band above the periphery, umbilicus 

 wider ; v. sitbaperta, whitish, spire more depressed, umbilicus wider ; v. 

 leucozona, violet or reddish-brown, whitish band at periphery ; v. submaritima, 

 smaller, darker, slightly pyramidal ; v. carinata, strongly keeled, yellowish 

 white, compressed above. 



74 v. ornata, smaller, whitish, with one brown band above, and two to six 

 below ; v. major, larger ; v. Gigaxii, smaller, more depressed, reddish, spotted, 

 marked by two bands below ; v. subscalaris, conical, whorls more convex ; v. 

 alba, pure white, unicolor. 



75 v. instabilis, smaller, darker, spire more raised, umbilicus narrower, 

 sometimes streaked or spotted ; v. alba, white, unicolor ; v. lutescens, dirty- 

 yellowish, unicolor ; v. minor, smaller. 



76 v. alba, white unicolor ; v. Turtonii, almost flat above ; v. minor 

 smaller ; v. pyramidalis, subconical, spire more raised. 



