NO. 5 MIDDLE CAMBRIAN ANNELIDS I25 



Geographic distribution. — Middle Cambrian: (35k) 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.) north- 

 east of Burgess Pass, above Field, British Columbia. 



Generic name derived from Pollinger, name of mountain of Presi- 

 dent range, British Columbia, Canada. 



POLLINGERIA GRANDIS, new species 



Plate 21, figs. 7, 8, and 9 



This is a much larger form than JViwaxia corrugata. One speci- 

 men that has the anterior end broken ofif measures 12 cm. in length, 

 with a width midway of 7 cm. Individual scales vary in length 

 from 10 to 15 mm. The scales are thin, smooth, elongate, and 

 variable in outline as shown by figs. 7-9. They occur in great num- 

 bers scattered on the surface of partings of the shale, but in only 

 one example are they grouped together to indicate the size and form 

 of the dorsal surface. Nothing is known of the body of the annelid. 



One of the curious facts connected with the scales is that a con- 

 siderable proportion of them have been traversed by a minute anne- 

 lid, the trail of which curves and coils about within the area of the 

 scale. This indicates that there was some animal matter attached 

 to the scale which the minute annelid was seeking. 



The scales of this species are so radically dififerent from those of 

 Wizi'axia that they do not fall within that genus. There are no 

 dorsal spines so far as known. 



The presence of two or three other species of annelids is shown 

 by the presence of scales that vary materially from those of Polliii- 

 geria grandis and Wizvaxia corrugata. 



Formation and locality. — Middle Cambrian: (35k) 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.) north- 

 east of Burgess Pass, above Field. British Columbia. 



WORTHENELLA, new genus 



As this genus has but one known species the description of the 

 latter will sufficiently define the genus. 



Genotype. — Worthenella camhria, 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. 



