Subject ASC000107v
The Quarterly journal of the Geological Society of London.
v.58 (1902), Page [112] (1902)
Smithsonian Libraries
BHL Page 41675541
Keywords
biology invertebrates mollusk fossil operculum cone Cambrian Malvern Hills shell bivalves opercula internal cast mollusc Hyolithus fistula cambrian malvern hills apex Teretes lower cambrian middle cambrian Orthotheca Fossil Malvern