66 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 57 



DESCRIPTION OF PLATE 12 



s. Stomach. 

 cs. Intestine. 

 uL Umbrella lobes. 



PAGE 



Eldonia ludzi'igi Walcott (see also text fig. 5 and pis. 8-11) 46 



Figs, i and 2. Two specimens showing corrugated stomach, intestine, 

 and traces of the radial canals of the umbrella. X -■ 

 U. S. National Museum, Catalogue Nos. 57552 and 

 57553. respectivelj^ 

 3. A large specimen slightly reduced in size. This shows 

 a portion of the lobes of the umbrella (ul), traces of 

 the radial canals in the lobes, and the stomach (s). 

 U. S. National Museum, Catalogue No. 57554. 



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

 Middle Cambrian ; dark siliceous shales in the Burgess shale 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 



Cohimbia. 



