Page:Walcott Cambrian Geology and Paleontology II.djvu/270

 above Field on the line of the Canadian Pacific Railway, British Columbia, Canada.

The generic name is derived from Odaray, the name of a peak west of Lake O'Hara and south of Hector, on the Canadian Pacific Railway, British Columbia, Canada.

Several specimens of the valves of this large fine species occur in the collection, but unfortunately all of them are more or less crushed and distorted. The one illustrated on plate 34 (natural size) indicates that the test of the carapace was very thin and readily wrinkled and broken. This specimen has, projecting from under the posterior margin of the valve, portions of three of the posterior segments of the abdomen with one of the large cercopods attached and one crowded under and out of place.

There is no probability of this genus or species being confused with any described form.

Formation and locality.—Middle Cambrian: (35k) Burgess shale member of the Stephen formation (phyllopod bed), 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.

The generic description is included with that of the type species.

Genotype.—Fieldia lanceolata, new species.

Stratigraphic range.—The stratigraphic range is limited to a layer in a band of dark siliceous shale about 4 feet in thickness forming a part of the Burgess shale member of the Stephen formation.

Geographic distribution.—On the slope of the ridge between Wapta Peak and Mount Field, north of Burgess Pass, and about 3800 feet above Field on the line of the Canadian Pacific Railway, British Columbia, Canada.

The generic name Fieldia is derived from Field, the name of a mountain rising above Burgess Pass northeast of Field, British Columbia, Canada.

This species is so distinctly characterized by the long slender form of its valves that it is not apt to be confused with any other species. It is further characterized by five narrow longitudinal bands.