land crab

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of various terrestrial crabs of the family Gecarcinidae of tropical regions, having a large squarish body.

from The Century Dictionary.

• noun A crab of terrestrial rather than aquatic habits, such as any of the Gecarcinidæ. Also called mountain-crab.
• noun A burrowing crayfish, Engæus fossor, of Tasmania and Victoria (Australia), which forms crab-holes.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Any of the land-based crabs of the Gecarcinidae family
• noun Any of the land-based crabs of the order Gecarcinucidae family