This is an exquisite specimen of a rare trilobite of the species Acernaspis orestes from the Lower Silurian of Canada. 

This is a trilobite of the species Aphelaspis westropi from the upper Cambrian of  Cranbrook in British Columbia.

Here is a beautiful trilobite plate with several specimens of the species Rielaspis elegantula from the Silurian of Canada.