USGS professional paper · 1914 · 48 citations · 0 references
Life SciencesMarine BiologyZoologyInvertebrate PaleontologyInvertebrate ZoologyMarine Invertebrate BiologyArthropod PaleontologyInvertebrate AnatomyInvertebrate EvolutionInvertebrate Fossil TaxonomyInvertebrate Trace FossilsMarine Invertebrate ZoologyMarine Invertebrate AnatomyMarine Invertebrate DiversityMarine Invertebrate MorphologyMarine Invertebrate PhylogenyMarine Reptile Paleobiology