The Shell-Collector’s Handbook. 43 
Mantle concentrically striated or granulated ; respi- 
ratory orifice situated on posterior half of mantle ; 
tail carinated, and without a slime gland. 
(Subgenus, Amalia, Moq.—Mantle granulated. 
Subgenus, Eulimax, Moq.—Mantle concentrically 
striate.) 
Famity III.—Testacellide. 
Shell small, auriculate, external, placed on the 
hinder portion of the body, covering the mantle; res- 
piratory orifice on the right side below the mantle. 
13. Testacella, Cuvier. 
Famity 1V.—Helicidee. 
Shell spiral. Body distinct from the foot; tentacles 
four, retractile, cylindrical, the upper pair being the 
longest, and bearing the eyes at their apices. 
14. Sueccinea, Drap.—Shell oval or oblong, thin, 
transparent ; spire small; mouth large and obliquely 
oval; non-operculated. Animal not capable of 
entirely entering its shell. 
15. Vitrina.—Drap. Shell subglobular, thin, 
flattened; mouth large and semilunar; umbilicus. 
wanting. 
16. Zonites, Montf.—Shell orbicular, depressed,. 
umbilicated ; mouth obliquely crescent-shaped. 
17. Helix, Linn.—Shell globular, convex, or 
flattened ; mouth more or less circular or oval; outer 
lip generally thick, and possessing an internal rib, 
sometimes reflected and provided with tubercles or 
teeth ; umbilicus usually distinct. 
18. Bulimus, Ehrenb.—Shell oval or oblong- » 
