Diagnosis
Shell subglobose, 13.5-23.9 mm in height and 18.0-28.4 mm in width. Shell generally pale brown to olive green with white lip (rarely pale pink). Mantle pale yellow to yellow. Relative lengths of penis and vagina very long and about equal in length.
Description
Shell : Subglobose, 13.5-23.9 mm in height and 18.0-28.4 mm in width. Spire moderately elevated. Aperture roundly ovate, height 10.0-13.5 mm and width 10.8-18.7 mm. Total number of whorls 4.8-5.7. Last teleoconch whorl rounded, or with slight angulation; height 12.3-21.3 mm. Shell sculpture consists of coarse growth lines and weak pustules. Teleoconch periostracal sculpture of weak zigzag ridges. Protoconch sculpture weakly pustulose. Shell uniform brown to tan or olive green, darker coloured individuals not uncommon. Red umbilical patch typically absent, occasionally faintly present. Red subsutural band very thin. Supraperipheral band absent. Inner lip white (rarely pale pink), strongly reflected, largely occluding umbilical depression. Outer lip moderately deflected below midline of last whorl. Umbilicus closed to slightly open.
Dimensions of types: neotype of Helix corneovirens (AMS C.205172), SH—18.9 mm, SW—23.5 mm, AH—13.1 mm, AW—15.2 mm, BW—15.7 mm, TW—5.3 whorls;
Non-genital Anatomy. Animal grey; mantle pale yellow to yellow. Kidney approximately 50-59% of length of mantle roof.

Meridolum corneovirens differs from other members of the genus by its typically pale uniform shell with white lip and lack of red umbilical patch. An unusual feature of the biology of M. corneovirens is its ability to bury into loose soil up to 10 cm below the surface.

Meridolum corneovirens is wholly restricted to western Sydney and is primarily associated with the Cumberland Plain and Castlereagh Woodland vegetation types. The species occasionally occurs along the edges of Coastal River Flat Forest, where it meets either of the above forest types. Meridolum corneovirens is mostly found under logs and other debris, and in the leaf litter. Where conditions permit it will bury into loose soil especially under logs and around the bases of large trees.