Page:Walcott Cambrian Geology and Paleontology II.djvu/216

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142
SMITHSONIAN MISCELLANEOUS COLLECTIONS
VOL. 57
DESCRIPTION OF PLATE 22
PAGE
Planolites sp. ?
Fig. 1. (Natural size.) Portion of a trail associated with Ottoia prolifica (pl. 19) illustrating a very common type of trail in the Burgess shale. U. S. National Museum, Catalogue No. 57642.
Worthenella cambria Walcott 126
Fig. 2. (✕ 2.) The type specimen as it occurs flattened on shale. U. S. National Museum, Catalogue Nos. 57644 and 57645.
Amiskwia sagittiformis Walcott 112
Figs. 3 and 4. (✕ 3.) Flattened specimens described in the text. U. S. National Museum, Catalogue Nos. 57644 and 67645.
Ottoia minor Walcott 129
Fig. 5. (✕ 2.) An elongated specimen that occurs flattened on the shale. U. S. National Museum, Catalogue No. 57646.
6. (✕ 2.) A small contracted specimen. U. S. National Museum, Catalogue No. 57647.

All of the specimens illustrated on this plate are from locality (35k) Middle Cambrian: dark siliceous shales in the Burgess shale member of the Stephen formation on the west slope of the ridge between Mount Field and Wapta Peak, one mile (1.6 km.) northeast of Burgess Pass, above Field, British Columbia.