Page:Walcott Cambrian Geology and Paleontology II.djvu/220

DESCRIPTION OF PLATE 23
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Canadia setigera Walcott				119
	Fig.	1.	(✕ 2.) A slender flattened specimen showing bundles of setæ and one of the tentacles of the head on the left end. U. S. National Museum, Catalogue No. 57648.
		2.	(✕ 2.) Posterior portion of a slender specimen. U. S. National Museum, Catalogue No. 57649.
		3.	(✕ 3.) A specimen that is contracted more than those represented by figures 1 and 2. This brings the parapodia with their bundles of setæ nearer each other. U. S. National Museum, Catalogue No. 57650.
Canadia spinosa Walcott				118
	Fig.	4.	(✕ 2.) Lateral view of a specimen flattened in the shale. U. S. National Museum, Catalogue No. 57651.
		5.	(✕ 3.) Anterior portion and head from the ventral side. U. S. National Museum, Catalogue No. 57652.
		6.	(✕ 2.) Ventral view of anterior portion and head showing segments of body, parapodia, and bundles of setæ. U. S. National Museum, Catalogue No. 57653.
		7.	(✕ 2.) Dorsal view showing dorsal setæ and bundles of projecting ventral setæ; also the head and tentacles. U. S. National Museum, Catalogue No. 57654.
Aysheaia pedunculata Walcott				117
	Fig.	8.	(✕ 2.) The type specimen as it occurs lying beside a specimen of Ottoia prolifica. (See pl. 19.) U. S. National Museum, Catalogue No. 57655.
		9.	(✕ 4.) Anterior portion of fig. 8, enlarged to show more detail.

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.