Hesperiella Holzapfel, 1889

Australian Carboniferous species. Hesperiella elongata n.sp., from 'Rangari'; HesperieUa planorbis n.sp., from 'Marohn'; Hesperiella robertsi Yoo, 1988, from 'Marohn'.

Remarks. The structure of the submerged protoconch of Hesperiella has been discussed by Knight (1941), Batten (1966) and Yoo (1988). It is almost certain that this genus has a hyperstrophically coiled dextral shell. Hesperiella has a narrow selenizone seen only in the final whorl. The slit is observed in the juvenile specimens (PI. 7 figs 10-12), although it is not obvious in the adult shells.