62 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 57 



I 



DESCRIPTION OF PLATE 10 



cr. Central ring. 

 re. Radial canals, 

 s. Stomach. 



PAGE 



Eldonia ludwigi Walcott (see also text fig. 5 and pis. 8-9 and 11-12) . ... 46 

 Fig. I. A large individual very much compressed and distorted. The 

 central ring (cr), radial canals (re), and stomach (s) are 

 indicated. A second specimen that lies under the large 

 specimen is shown on the left by the convoluted stomach. 

 Natural size. U. S. National Museum, Catalogue No. 

 57546. 



2. A specimen showing the outlines of the stomach (s) and the 



large central canal. X 2. U. S. National Museum, Cata- 

 logue No. 57547- 



3. Two specimens of the stomach with traces of the umbrella. 



The strong annulation of the stomach is shown by the speci- 

 men on the lower right side. X 2. U. S. National Museum, 

 Catalogue No. 57548. 



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 kin.) northeast of Burgess Pass, above Field, British 

 Columbia. 



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