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

DESCRIPTION OF PLATE 22
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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.