Subject ASC0001fu8
The Quarterly journal of the Geological Society of London.
v.10 (1854), (1854)
Smithsonian Libraries
BHL Page 35013147
Keywords
shell-valve shell double area trilobed cardial process dorsal valve ventral valve Chonetes Productus fossil limestone vertical section longitudinal cut adductor muscle cardinal muscle comoides giganteus horridus longispinus chonete productus shell valves trilobed valve