NO. 5 MIDDLE CAMBRIAN ANNELIDS I23 



Formation and locality. — Middle Cambrian: (35k) Burgess shale 

 member of the Stephen formation, on the west slope of the ridge 

 between Mount Field and Wapt^^ Peak, one mile (1.6 km.) north- 

 east of Burgess Pass, above Field; and (14s) about 2300 feet (701 

 m.) above the Lower Cambrian and 2700 feet (823 m.) below the 

 Upper Cambrian, in the Ogygopsis zone of the Stephen formation, 

 at the great " fossil bed " on the northwest slope of Mount Stephen, 

 above Field on the Canadian Pacific Railway ; both in British 

 Columbia, Canada. 



WIWAXIDJE, new family 



Body oval ; covered with dorsal ribbed scales and strong, elongate 

 spines. 

 One genus, Wiwaxia. 



WIWAXIA, new genus 



The generic and specific descriptions are united under the descrip- 

 tion of the species. 



Genotype. — Wizvaxia corrugaia (Matthew). 



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 at locality (35k) 

 near Burgess Pass, and on the slope of Mount Stephen it was found 

 in the trilobite beds of locality (14s). 



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; 

 also on the slope of Mount Stephen 2300 feet above Field ; both in 

 British Columbia, Canada. 



Generic name derived from Wiwaxy, name of several small moun- 

 tain peaks north of Lake O'Hara, British Columbia, Canada. 



WIWAXIA CORRUGATA (Matthew) 

 Plate 21, figs. 1-4 

 Orthotheca corrngata MATTHEWy 1899, Trans. Roy. Soc. Canada, 2d ser., 



Vol. 5, sec. 4. p. 42, pi. I, fig. 3. 

 Orthotheca corrngata Walcott, 1908, Canadian Alpine Journal, Vol. i, 

 No. 2, p. 246, pi. I, fig. II. 



This fine species is represented by a number of specimens of 

 nearly the entire dorsal surface, which appears to have been covered 

 by scales. The best example of what was probably the entire dorsal 

 outline is illustrated by fig. 2, the anterior end being at the left or 

 next to the side of the plate. The scales, as on the recent Aphro- 



