Smithsonian Report, 1 915.— Walcott. 



Plate 10. 



SlDNEYlA INEXPECTANS WaLCOTT. 



'^ nf ^ho^rL*!"^^^^^''^-^ ^°^^'^ 15,000,000 years ago; discovered by Mr. Walcott. The spiny claws 

 ?L7.t^; f 5f '^^^^^'1.'^^"*^**^*^'^° (.SWMcyM inexpccians Walcott) are .shown as a light patch in 

 the center ol Plate 9. From Burgess Pass shale, Field, British Columbia. 



