64 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 57 



DESCRIPTION OF PLATE 11 j 



cr. Central ring. i 



re. Radial canals. 3 



s. Stomach. j! 



PAGE I 



Eldonia ludwigi Walcott (see also text fig. 5 and pis. 8-10 and 12) 46 1 



Fig. I. An individual flattened in the shale, showing the lobate char- j 



acter of the umbrella. X 2. U. S. National Museum, Cata- .1 



logue No. 57549- J 



2. Another specimen with the radiating canals very closely de- j 



fining the lobes. X 2. U. S. National Museum, Catalogue .] 



No. 57550. 



3. A fragmentary specimen that shows the radial canals (re) and 



central ring (cr) with unusual clearness. X 2. U. S. 

 National Museum, Catalogue No. 57551. 



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 

 Columbia. 



i 



