Keywords: Walcott Cambrian Geology and Paleontology II plate 04.jpg Plate 2 Middle Cambrian Merostomata Sidneyia 1 Sidneyia inexpectans <small> Walcott </small> Hurdia victoria <small> Walcott 1912 </small> 2 Sidneyia inexpectans <small> Walcott </small> Hurdia victoria <small> Walcott 1912 </small> 3 Sidneyia inexpectans <small> Walcott </small> Hurdia victoria <small> Walcott 1912 </small> 4 Sidneyia inexpectans <small> Walcott </small> Hurdia victoria <small> Walcott 1912 </small> Charles D Walcott Middle Cambrian Merostomata Smithsonian Miscellaneous Collections Volume 57 Number 2 Publication 2009 City of Washington Published by the Smithsonian Institution April 8 1911 Creator Charles Doolittle Walcott J M Jessup 1911 PD-old-80 Walcott Cambrian Geology and Paleontology II plates |