Page:Walcott Cambrian Geology and Paleontology II.djvu/118

DESCRIPTION OF PLATE 13
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Laggania cambria Walcott				52
	Fig.	1.	Ventral view, natural size. m = mouth. U. S. National Museum, Catalogue No. 57555.
Mackenzia costalis Walcott				55
	Fig.	2.	A small individual showing the side view with the mouth. Natural size. U. S. National Museum, Catalogue No. 57556.
		3.	A fragment of a large specimen that may belong to this species. Natural size. U. S. National Museum, Catalogue No. 57557.
Louisella pedunculata Walcott				53
	Fig.	4.	An individual flattened in the shale. ✕ 2. The series of small tube feet are flattened down on the surface, but show quite clearly in a double row. U. S. National Museum, Catalogue No. 57558.

All of the specimens illustrated on this plate are from locality (35k) Middle Cambrian; dark siliceous shales in the Burgess shale 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.