188 HELICIDJE. 



" white-mouths " (hortensis) ; and he offered to give odds 

 of ten to one in favour of the former. The variety hybrida 

 seems, however, to connect the two above-mentioned 

 forms, so far as concerns their conchological distinc- 

 tion ; and the only malacological character of importance, 

 upon which a difference between them can be founded, 

 consists in a slight variation of shape in their love-darts. 

 With great deference therefore to the opinion of those 

 who rank these forms as separate species, I cannot help 

 regarding H. nemoralis as the type, and H. hortensis and 

 H. hybrida as local or casual varieties of one and the 

 same species. I have never found any two of these forms 

 living together; and M. Bouchard-Chantereaux and 

 others have made the same remark. 



6. H. ARBUSTO'RUM*, Linn6. 



H. arbustorum, Linn. Syst. Nat. ed. xii. p. 1245 ; F. & H. iv. p. 48, 

 pi. cxv. f. 5, 6. 



BODY lustrous, dark grey or almost black above, and of a 

 light slate-colour below, covered with round tubercles : mantle 

 marked with a few indistinct milk-white specks : tentacles 

 slender, much diverging, glossy and black ; bulbs very 

 globular : foot narrow and slightly keeled at the tail, with 

 the sides transversely grooved. 



SHELL globular, somewhat compressed below, usually rather 

 solid and nearly opaque, glossy, yellowish mottled with brown, 

 mostly having a single brown spiral band round the middle of 

 each whorl, or a little above it, closely but coarsely and irre- 

 gularly ridged in the line of growth, and very finely striate in 

 a spiral direction : epidermis rather thin : whorls 5-6, convex, 

 the last occupying about three-fifths of the shell : spire vary- 

 ing in length, but usually depressed, and always ending in 

 a blunt point : suture rather deep : mouth forming a segment 

 of two-thirds of a circle : outer lip thick, white and reflected, 

 sometimes strengthened by an internal, but not well-defined 

 rib, much inflected above and rounded beneath : inner lip con- 



* Inhabiting copses. 



