Page:Walcott Cambrian Geology and Paleontology II.djvu/269

 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.—Tuzoia retifera, new species.

Stratigraphic range.—The stratigraphic range is limited to 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 is derived from Tuzo, the name of one of the mountains of the "Valley of the Ten Peaks" south of Laggan, Alberta, Canada.

Of this genus and species only one specimen is known. Its large size, form, and reticulated surface serve to distinguish it from all other known forms. The figure on plate 33 shows very clearly that the test was thin, as it has been crowded and wrinkled near the longitudinal center.

The reticulated surface marking is not unlike that of the carapace of the recent Nebaliopsis typica Sars.

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.—Odaraia alata, new species.

Stratigraphic range.—The stratigraphic range is limited to 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