I 3 2 HELICID&. 



species congregate in social groups, when they may 

 be seen polishing each other's shells with their slimy 

 foot. 



15. H. PISA'NA,* MULLER. PL. VIII. 



Body slightly transparent, yellowish-grey above with a reddish 

 tint in front, brownish -yellow beneath, closely tuberculate ; ten- 

 tacles yellowish-grey, very finely shagreened, rather slender, except 

 at the base where they are broad and somewhat diverging, bulbs 

 globular, darkish red \foot somewhat truncate in front, gradually 

 narrowing to a point behind, and not keeled ; lingual ribbon 

 with 120 rows of 71 teeth = 8520. 



Shell subglobular, slightly depressed above, rounded beneath, 

 solid, nearly opaque, somewhat glossy, cream-coloured, encircled 

 with chocolate-brown bands which vary in number, and marked, 

 especially on the upper volutions, with dots and irregular blotches 

 of the same colour, which give to the shell an elegantly mottled 

 appearance, with irregular striae in the line of growth, which are 

 crossed by finer and closer lines causing the surface of the shell 

 to be finely reticulated ; periphery rounded : epidermis scarcely 

 visible; whorls 5-5!, convex, but flattened at their summits, 

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

 what produced, apex obtuse and of a brownish colour tinged 

 with violet ; mouth forming about three-fourths of a circle, inside 

 usually pink or rose-colour, and furnished with a slight rib ; 

 outer lip thickish, somewhat reflected near to, and more so over 

 the umbilicus which is very small and oblique. 



Inhabits sandhills and other places near the sea, 

 at Tenby and Manorbeer in Pembrokeshire, St. Ives 

 and Whitsand Bay, Cornwall, Balbriggan Strand in 

 Dublin Bay, and in Jersey. It also occurs at Vazon 

 Bay in Guernsey, where Mr. Lukis in 1860 placed 

 some specimens which he had brought from Jersey ; 

 the colony is reported to be thriving, and if un- 



* It was first found at Pisa. 



