Smithsonian Report, 1 91 5.— Walcott. 



Plate 11, 



Middle Caivibrian Medusa and Holothurian. 



cr=central ring; p=digitate tentacle; rc=radial canals; .':=stomaeh; ;r=four large lobes. 

 1,2. PeytoianathorsUWalcoit. (Medusae, or jellyfish.) S. Eldonialudwigi'Wedcott. (Holothurian.) 



From locality 35k, Middle Cambrian: Burgess shale member of the Stephen formation, west 

 slope of ridge between Mount Field and Wapta Peak, 1 mile (1.6 km.) northeast of Burgess 

 Pass, above Field, British Columbia. 



