NO. 6 MIDDLE CAMBRIAN BRANCHIOPODA, ETC. 187 



between Mount Field and Wapta Peak, one mile (1.6 km.) northeast 

 of Burgess Pass, above Field, British Columbia. 



TUZOIA, new genus 



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. 



TUZOIA RETIFERA, new species 

 Plate 33, fig. 2 



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 Nehaliopsis 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. 



ODARAIA, new genus 



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 



^Challenger Rept., Vol. 19, Pt. 56, 1887, pi. 3, figs, i, 5, and ^.. 



