106 TRACHELIPODA. 



Genus 78— HELICINA— Zawmrc-;^. 



Generic Character. — Shell subglobose, imperforate; aper- 

 ture entire, and semi-oval; columella callous, transverse, 

 flattened, and forming an angle at the base of the outer lip ; 

 a hoi'ny operculum. 



The shells of this genus are distingmshed from the Helices, by theu- 

 transverse callous columella, deijressed and diminished in thickness 

 at the lower part. 



Helicina major. — The Great Helicina. Plate XIII. 

 fig. 22. Citron-coloured, inside pink ; pillar and outer lip 

 white ; the former broadly reflected on the columella. 



Genus 79.— ANASTOMA.— ZamarcA. 



Generic Character Shell suborbicular ; spire convex 



and obtuse ; aperture rounded, dentated within, turned up- 

 wards and grinning ; margin of the outer lip reflected. 



Anastoma glohulosa. — The Globular Anastoma. Plate 

 XIII. fig. 25. Suborbicular, obsoletely carinated, smooth, 

 and white ; aperture with six teeth ; reddish-brown. 



Gewus 80.— CAROCOLL A.— Zawzarc/i. 



Generic Character — Shell orbicular, more or less convex 

 or conoid above, with the circumference acutely angulated ; 

 aperture transverse, contiguous to the axis of the shell ; 

 outer lip subangular, frequently dentated below. 



Carocolla lapicida. — The Stone-cutting Carocolla. 

 Plate XIII. fig. 26. Depressed above, convex beneath, 

 broadly umbilicated, and transversely striated ; reddish horn- 

 coloured; body-volution carinated. Seven-eighths of an 

 inch in breadth. Inhabits dry situations in Europe. 



Genus 81. — HELIX — Linnceus. 



Generic Character — Shell orbicular, convex or conoid 

 above; sometimes globular, with the spire somewhat ele- 

 vated ; aperture entire, transverse, very oblique, contiguous 



