Keywords: Hurdia victoria USNM PAL 57490.jpg Sidneyia inexpectans Walcott Outer portion of the third pair of appendages of the cephalo-thorax • 2 In this there appears to have been a somewhat different development of parts as compared with those seen in figs 3 and 4 U S National Museum Catalogue No 57490 35k between Mount Field and Wapta Peak one mile 1 6 km northeast of Burgess Pass above Field British Columbia British Columbia Canada Middle Cambrian Burgess shale member of the Stephen formation National Museum of Natural History Paleobiology Collections http //collections si edu/search/results jsp q PAL57490 USNM PAL 57490 1911 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 PD-old-80 Hurdia victoria Walcott Cambrian Geology and Paleontology II extracted images |