l88 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 57 



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 Rail- 

 way, British Columbia, Canada. 



ODARAIA ALATA, new species 

 Plate 34, fig. 2 



Several specimens of the valves of this large fine species occur in 

 the collection, but vinfortunately 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. 



FIELDIA, new genus 



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 



FIELDIA LANCEOLATA, new species 



Plate 32, fig. 8 

 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. 



