AUSTRALIAN LAND SHELLS. 



Sub-Kingdom II. MOLLUSCA. 



Class II. GASTEBOPODA. 

 Order II. PULMONIFEBA. 

 Section A. INOPEECULATA. Section B. OPEECULATA. 



Section A. INOPEECULATA. 

 Family. HELICID^]. 



Shell external, usually well developed and capable of 

 containing the entire animal ; aperture closed by an epi- 

 phragni during hybernation. 



Animal hermaphrodite, having a short well developed 

 retractile head, with four cylindrical, retractile tentacles, 

 the upper pair longest, and bearing eye-specks at their 

 summits, the lower occasionally wanting [Section Vertigo). 

 Body spiral, distinct from the foot ; respiratory orifice near 

 the base of the right ocular tentacle, small and valve-like ; 

 mouth armed with a horny, dentated, crescent-shaped upper 

 mandible; lingual membrane oblong, central teeth incon- 

 spicuous, laterals numerous, similar. 



Genus 



HELIX. Linnjeus. 



Shell umbilicated, perforate, or imperforate, discoidal, 

 globosely-depressed or conoidal ; aperture transverse, ob- 

 lique, lunar or roundish ; peristome patulous or reflected, 

 margins distinct, remote, or united by callus. 



Animal with a long foot, pointed behind ; lingual teeth 

 usually in straight rows, edge teeth dentated. 



