Smithsonian Report, 1915. — Walcott. 



Plate 1 1 , 



Middle Cambrian Medusa and Holothurian. 



cr=central ring; p=digitate tentacle; rc=radial canals; s=stomach; .r= four large lobes. 

 1,2. I'eytoianathorsii\\a.leoU. (Medusae, or jellyfish.) :i. Eklonialudwic/iWalcott. (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. 



