Page:Walcott Cambrian Geology and Paleontology II.djvu/318

DESCRIPTION OF PLATE 31
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Hymenocaris perfecta Walcott				183
	Fig.	1.	(✕2.) Side view of the right valve, showing the form of the valve, abdomen, and numerous appendages. Adductor muscle scar (ad), intestine (i), thoracic legs (thl), gills (br). U. S. National Museum, Catalogue No. 57703.
		2.	(✕1.5.) Dorsal view of a specimen from which the test has been exfoliated. This shows the antenna (a), adductor muscle scars (ad), intestine (i), and traces of the basal joints of the legs. U. S. National Museum, Catalogue No. 57704.
		3,	4, and 5. (✕2.) Illustrations of the posterior end of the abdomen with cercopods. U. S. National Museum, Catalogue Nos. 57705, 57706, and 57707.
		6.	Specimen in upper left hand corner of figure. (Natural size.) Dorsal view of a crushed speicmen showing the carapace, abdomen, and cercopods. U. S. National Museum, Catlogue No. 57708.
Leanchoilia superlata Walcott				170
	Fig.	6.	Lower specimen. (Natural size.) Side view of the type and only specimen known of the species and genus. U. S. National Museum, Catalogue No. 57709.

All of the specimens illustrated on Plate 31 are from locality (35k) Middle Cambrian: 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.