6o 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 57 



DESCRIPTION OF PLATE 9 



cr. Central ring. 



g. Gonad ? 



re. Radial canals. 



s. Stomach. 



uL LTnibrella lobes. 



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



Fig. I. Central portions of an individual preserving the stomach (s), 

 and the radial canals crossing it from side to side. The out- 

 line of the intestine is shown on the right of the light- 

 colored stomach and below on the right the oral chamber 

 and at its mouth traces of two digitate tentacles. X 2. U. 

 S. National Museum, Catalogue No. 57541. 



2. An individual (X2) showing the stomach (s), radial canals, 



and what appears to be the umbrella at (p). U. S. National 

 Museum, Catalogue No. 57542. 



3. An individual (X 2) laterally compressed, showing radial canals, 



stomach (s), and on the lower side a portion of the margin 

 of the umbrella. U. S. National Museum, Catalogue No. 

 57543- 



4. An individual (X2) showing radial canals, stomach, and what 



appears to be the crushed-down umbrella lobe. U. S. 

 National Museum, Catalogue No. 57544. 



5. An individual showing the stomach (s) and radial canals (re), 



lobed margin of the umbrella (ul and p), and concentric 

 muscle fibers of the subumbrella surface, and on the right 

 side at (g) what appears to be a gonad. Natural size. U. 

 S. National Museum, Catalogue No. 57545. 



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. 



