Abstract
Cryptomya (Venatomya) blackburnae sp.nov from mideastern Queensland, Northern Territory and north Western Australia is described and figured. (V.) elliptica (A.Adams, 1851) from New South Wales and Queensland is refigured and a detailed description given. Tugonia (Distugonia) inopinata (Iredale, 1936) from New South Wales and Queensland is briefly discussed. A lectotype is designated for Sphaenia elliptica A.Adams, 1851.