144 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 5/ 



DESCRIPTION OF PLATE 23 



PAGE 



Canadia setigera Walcott 1 19 



Fig. I. (X 2.) A slender flattened specimen showing bundles of setae 

 and one of the tentacles of the head on the left end. U. S. 

 National Museum, Catalogue No. 57648. 



2. (X2.) Posterior portion of a slender specimen. U. S. National 

 Museum, Catalogue No. 57649. 



3- (X3-) A specimen that is contracted more than those repre- 

 sented by figures i and 2. This brings the parapodia with 

 their bundles of sette nearer each other. U. S. National 

 Museum, Catalogue No. 57650. 



Canadia spinosa Walcott 118 



Fig. 4. (X2.) Lateral view of a specimen flattened in the shale. 

 U. S. National Museum, Catalogue No. 57651. 



5. (X 3.) Anterior portion and head from the ventral side. U. 



S. National Museum, Catalogue No. 57652. 



6. (X2.) Ventral view of anterior portion and head showing 



segments of body, parapodia, and bundles of setae. U. S. 

 National Museum, Catalogue No. 57653. 



7. (X2.) Dorsal view showing dorsal setse and bundles of pro- 



jecting ventral setse ; also the head and tentacles. U. S. 

 National Museum, Catalogue No. 57654. 



Aysheaia pedunculata Walcott 117 



Fig. 8. (X 2.) The type specimen as it occurs lying beside a specimen 

 of Oftoia proliftca. (See pi. 19.) U. S. National Museum, 

 Catalogue No. 57655. 

 9. (X 4) Anterior portion of fig. 8, enlarged to show more detail. 



All of the specimens illustrated on this plate are from locality (35k) 

 Middle Cambrian : dark siliceous shales in the 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. 



