Subject ASC00011hw
The Quarterly journal of the Geological Society of London.
v.56 (1900), Page 478 (1900)
Smithsonian Libraries
BHL Page 41487834
Keywords
fossil graptolite Monograptus scanicus Lower Ludlow formation diagram microscope illustration thecae plant Aberdew Hill sicula monograptus scanicus extremity thecase monograptus