NO. 5 MIDDLE CAMBRIAN ANNELIDS II9 



Observations. — This beautiful species recalls in its dorsal aspect 

 the recent Palmyra aurifera ^ and Chlaia euglochis Ehlers.^ The 

 latter has almost the same grouping of seta^ on the parapodia. 



The species is represented by a number of specimens, but none 

 exhibit the detailed structure of the head. 



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.) northeast 

 of Burgess Pass, above Field, British Columbia. 



CANADIA SETIGERA, new species 



Plate 23, figs. 1-3 



This species differs from C. spinosa in being more elongate, 

 slender, and with much smaller bundles of finer setse. Its characters 

 are well illustrated by figs, i and 3. A series of 36 specimens indi- 

 cate that the elongate forms represented by figs, i and 2 are con- 

 nected by numerous gradations with the form represented by fig. 3. 



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 knu) north- 

 east of Burgess Pass, above Field, British Columbia. 



CANADIA SPARSA, new species 



A slender form with only two strong setae on each very short 

 parapodia. Finer setae may occur, but they are not shown on the 

 one specimen which, in size and distance of the parapodia, resembles 

 the specimen represented by fig. 2, pi. 23. 



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. 



CANADIA DUBIA, new species 



This species is proposed to include a small chaetiferous annelid not 

 over 10 mm. in length. One specimen shows a bundle of very fine 

 setae on each side near the head. 



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.) northeast 

 of Burgess Pass, above Field, British Columbia. 



* Challenger Rept. Zoology, Vol. 12, 1885, pi. 9, fig. i. 

 ^Mem. Mus. Comp. Zool., Vol. 15, 1887, pi. i, fig. i. 



