ANALYTICAL KEY. 



MOLLTJSES WITH A HEAD. RESPIRING AIR OR WATER. 



Inopereulated. Me spiring air. 

 Vital organs not coiled. Shell rudimentary ; simple or subspiral. 



Respiratory chamber near the head, orifice towards the front ARION. 



Body stout, wrinkled with tuberosities, shell a few grains — ater. 



Body slender, wrinkled with leaflets, shell a few aggregated grains — hortensis. 



Respiratory chamber near the head, orifice quite in front GJEOMALA C US . 



Body cylindrically attenuated, shell a solid flat ovate shield — maculosus. 



Respiratory chamber near the head, orifice towards the hinder part LIMAX. 



Body stoutly oblong, keeled throughout, shell thick or obscure — Soioerbii. 



Body tapering, veined, keeled throughoat, shell thick, convex — gagates. 



Body cylindrically oblong, keeled towards the tail, shell very small — agrestis. 



Body gelatinous, striped, keeled towards the tail, shell thin — marginatum . 



Body tapering, slightly keeled towards the tail, shell unknown — brunneus. 



Body slender, compressed towards the tail, transparent, shell unknown — tenellus. 



Body cylindrically elongated, keeled towards the tail, shell nucleated...'..... — flavus. 



Body elongately tapering, keeled towards the tail, shell large, nucleated.... — cinereus. 



Respiratory chamber near the tail, covered by an external subspiral shell ... TJESTACELLA. 



Body yellowish, finely veined, shell small, triangularly ear-shaped — haliotidea. 



Body brown-mottled, rugosely veined, shell larger, squarely oblong — Maugei. 



Vital organs coiled within a spiral shell. 

 Inhabiting land. Tentacles retractile, toith the eyes at their summit. 



Carrying a depressly globose glassy shell, with shield in front, -obed VITRINA. 



Shell of three imperforate pellucid whorls smooth and shining — pellucida. 



Carrying a membranaceous inflated shell. Inhabiting wet places £ UCCINEA . 



Shell large, amber-coloured, yellowish, ovately-oblong, inflated — putris. 



Shell smaller, reddish-amber, eonstrietedly fusiformly inflated — elegans. 



Shell small, yellowish, oblong turbinated, but little inflated — oblong" ■ 



Canying an orbicular shell of few colourless shining whorls, lobed ZONITES. 



Shell comparatively large, rather narrowly umbilicated, of six whorls — eellarius. 



Shell smaller, narrowly umbilicated, of five glassy whorls — alliarius. 



Shell rather larger, openly umbilicated, of five dull opake whorls — nitidulus. 



Shell very small, rather largely umbilicated, of four greenish glassy whorls — purus. 



Shell very small, moderately umbilicated, of four stria-rayed whorls — radiatulus. 



