Page:Walcott Cambrian Geology and Paleontology II.djvu/212

DESCRIPTION OF PLATE 21
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Wiwaxia corrugata (Matthew)				123
	Fig.	1.	(✕ 2.) Portion of the dorsal surface with numerous scales and five of the dorsal spines. U. S. National Museum, Catalogue No. 57633.
		2.	(✕ 2.) Dorsal surface. The arrangement of the scales indicates that the anterior end was on the left side where the outline is slightly incurved. U. S. National Museum, Catalogue No. 57634.
		3.	(✕ 1.25.) A specimen crushed down so as to displace scales and spines. U. S. National Museum, Catalogue No. 57635.
		4.	(Natural size.) Scattered scales and spines on surface of shale. U. S. National Museum, Catalogue No. 57636.
Banffia constricta Walcott				130
	Fig.	5.	(Natural size.) A small specimen showing the two sections of the body. U. S. National Museum, Catalogue No. 57637.
		6.	(Natural size.) Anterior section and constriction with a portion of the posterior section. U. S. National Museum, Catalogue No. 57638.
Pollingeria grandis Walcott				125
	Fig.	7.	(✕ 2.) One of the larger scales. U. S. National Museum, Catalogue No. 57639.
		8.	(✕ 2.) Scale furrowed by minute annelid. U. S. National Museum, Catalogue No. 57640.
		9.	(✕ 2.) Scales differing in form. U. S. National Museum, Catalogue No. 57641.

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.