A bit late, but here's my bit.
Elachorbis Iredale 1915 is in Vitrinellidae, Rissooidea. Very likely a
synonym of Circulus Jeffreys 1865. Fossil & Recent here in NZ.
Coronadoa Bartsch 1946, according to Keen 1971, is a synonym of Sinezona
Finlay 1927, Scissurellidae. The description fits. Based on a juvenile.
Common in NZ.
Tasmocrossea Dell 1952 would appear to belong in Skeneidae, Trochoidea.
Spencer & Willan 1996 place it here.
Andrew