Sadlick, W. and Nielsen, M.F. (1963). Ontogenetic variation of some Middle Carboniferous Pleurotomarian Gastropods. Journal of Paleontology. 37: 1083–1103.
450263
Sadlick, W. and Nielsen, M.F.
1963
Ontogenetic variation of some Middle Carboniferous Pleurotomarian Gastropods.