Subject ASC0003ta3
The geological magazine, or, Monthly journal of geology.
Decade 3:v.3 (1886), Page 13 (1886)
Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
BHL Page 32502574
Keywords
graptolite Didymograptus vacillans Tullberg Dicellograptus forehammeri Geinitz Dicranograptus ramosus Hall Graptolites fossil graptus dichograptidae Planktonic Marine Fossils Graptolite Dichograptidae