134 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 57 



DESCRIPTION OF PLATE 18 



Legend : 



e = enteric canal. pr = parapodia. 



m = mouth s = set3e. 



p=papillse. 



PAGE 



Miskoia preciosa Walcott 1 14 



Fig. I. (X 2.) Anterior portion of a specimen 26 cm. in length. The 

 extruded proboscis is 5.5 cm. in length. The proboscis is 

 broken midway by a slight displacement of the shale. The 

 enteric canal is shown extending inward from the base of 

 the proboscis. U. S. National Museum. Catalogue No. 57616. 



2. (X2.) Portion of the body of the specimen of figure l, be- 



ginning 6 cm. back of the mouth or anterior end, showing the 

 enlargement of the enteric canal. 



3. (X2.) Anterior end of a body 9 cm. in length in which the 



proboscis appears to have been withdrawn. Setae about the 

 mouth, annular lines, and segments finely shown. U. S. 

 National Museum, Catalogue No. 57617. 



4. (X2.) Portion of a body showing the parapodia on left side. 



U. S. National Museum, Catalogue No. 57618. 



5. (X 2.) Nine (9) centimeters in length of terminal portion of 



annelid, the anterior portion of which is represented by 

 figure I. The parapodia are finely shown on the left side. 



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. 



