Page:Walcott Cambrian Geology and Paleontology II.djvu/287

 most courteous to me in connection with my work in the Canadian Rocky Mountains.

Formation and locality.—Middle Cambrian: (35) 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.

This species is founded on a single weathered specimen that we found in the shale about 80 feet above Emeraldella brocki. It differs from the latter mainly in its greater proportional width.

Formation and locality—Middle Cambrian: $$\left(\tfrac{35k}{10}\right)$$ Burgess shale member of the Stephen formation (about 75 feet above the phyllopod bed near the base of the shale) 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.


 * Limulava, 1911, Smithsonian Misc. Coll., Vol. 57, No. 2, p. 21. (Described as a new sub-order.)


 * Sidneyia inexpectans, 1911, Smithsonian Misc. Coll., Vol. 57, No. 2, p. 24, pl. 2, figs. 1-3, pl. 3, figs. 1-4, pl. 4, figs. 1-4, pl. 5, figs. 1-3, pl. 6, fig. 3, and pl. 7, fig. 1. (Original description and illustrations.)

A specimen found during the summer of 1911, text figure 10, shows the form of the head and four pairs of the cephalic appendages projecting forward in fine shape, but unfortunately the chelate terminal joints of the third pair are not attached. The antennæ are not preserved. The biramous appendages of the first 9 segments of the body are formed of an endopodite of four or five broad, short joints and