78 LAND AND FRESH-WATER SHELLS. 



of the total height of the shell. Length -^-f ths inch. Marshes 

 and ditch-banks. INIoderately common. S. Pfeifferi:'^ 



ie) Shell small, oval, somewhat like that of L. tnuicatida, hght 

 horn-coloured ; whorls four, convex ; suture deepish ; spire pro- 

 duced, with a blunt apex ; mouth oval, about the same length as 

 the spire. Distinguished from L. iruncatula by having no reflected 

 lip on the columeha. Length \ inch. Edges of ditches near 

 the coast, and on sanddunes near the sea. Rare. S. ohlonga. 



1 6. Vitrina. — Shell subglobular, thin, flattened; mouth large 

 and semilunar ; umbilicus wanting. 



{a) Shell depressed, thin, glossy, glassy-green ; whorls three to 

 four, the body-whorl being very large ; spire very short ; mouth 

 large, somewhat oval. Height ^Vth inch. Among moss and dead 

 leaves in woods and hedge-banks. Moderately common. 



V. pcUticida.^'^ 



7. Hyalina. (Zonites). — Shell orbicular, depressed, umbiU- 

 cated ; mouth obliquely crescent-shaped. 



{a) Shell slightly convex above, glossy, stride demi-effaced, 

 reddish above, whitish below, especially round the umbilicus; 

 whorls six to seven, the last whorl slightly dilated towards the 

 aperture ; umbilicus largish ; mouth oval, very oblique. Diameter 

 -J to |ths inch. Very local. Found only, as yet, at Guernsey, Tor- 

 quay, Falmouth, Bristol and Isleworth, London. II. Dmpamaldi. 



(b) Shell dirty yellow or pale horn-coloured, glossy, under 

 surface white, especially about the umbilicus ; whorls five to six ; 

 spire very flat ; umbilicus rather open ; mouth crescent-shaped. 

 Diameter \ inch. Under stones in fields and woods, about walls 

 in gardens. Common. H. ccUaria.^'^ 



^ V. ventricosa, spire more elevated, body whorl convex, aperture large, less 

 elevated, a little more than half the total height of the shell ; v. propinqua, 

 shell elongated, ventricose, body-whorl very large, spire short, aperture large, 

 oval ; v. elata, shell very slender, spire long and very tortuous, body-whorl 

 very contracted at its origin, aperture oval and scarcely one half of the total 

 height of the shell ; v. virescens, greenish, spire elongated, suture deep. 



^' v. Dilhvynii, nearly globular, last whorl very convex, spire more promi- 

 nent ; V. depressmscula, rather oval, flatter on both sides, spire scarcely 

 raised. 



^- v. coniplanata^ smaller, spire flatter ; v. compada, body-whorl less swollen, 

 not so white beneath, more compact and convex. 



