I20 HELICID/E. 



field glasses, which enabled me at once to distinguish 

 between the different forms. 



Var. I. hortensis. — Shell more globular, and usually smaller, 

 mouth and rib white, common. 



Var. 2. hybrida. — Shell smaller, mouth and rib pink or brown, 

 more local. 



Var. 3. major. — Shell much larger and more depressed. Sand- 

 hills and downs. Isle of Arran, Co. Galway, B.C. 



Var. 4. minor. — Shell much smaller, otherwise like hortensis. 

 Zetland (Barlee), Loch Carron, Rosshire (J. G. J.), B.C. 



Besides these varieties, monstrosities occasionally 

 occur ; in some cases the whorls are much produced, 

 or even separated, in others the spire is reversed. 



6. H. arbusto'rum,* Linni^. Pl. VII. 



Body very glossy, as if coated with moist varnish, bluish-black 

 or dark olive-green, thickly covered with coarse tubercles which 

 are oblong when the animal is extended and roundish when it is 

 at rest ; tentacles slender, upper pair considerably divided at 

 their base, gradually tapering, bulbs globular, tumid ; lower 

 tentacles very wide apart ; foot slaty-grey, its margins grooved, 

 ending in a rounded or bluntly pointed tail. 



Shell globose, somewhat compressed below, moderately solid, 

 glossy, scarcely semitransparent, yellowish-brown, dappled and 

 streaked with markings of a pale yellow or straw-colour and 

 usually having a dark brown band which encircles the centre of 

 the body whorl and the base of the upper volutions ; with strong 

 irregular ridges in the line of growth which are crossed by fine, 

 close-set, spiral striae ; epidermis thinnish ; whorls 5-6, convex, 

 body whorl occupying about two-thirds of the shell ; spire 

 usually somewhat depressed, apex obtuse ; S7iture deepish ; 

 mouth forming about two-thirds of an oval ; outer lip white, 

 thick, reflected, usually furnished with a slight internal rib of 

 the same colour ; inner lip thinly spread on the base of the 

 penultimate whorl ; umbilicus very small, oblique, nearly hidden 

 by the reflection of the outer hp. 



* Living in copses. 



