16 PLATE VIII. [Assembly 



Trilobites of the Niagara group. 



1. Caltmene blumenbachii [ or senaria? ] ( p. 55). 



2. Dalmania limulurus. 



3. Same, detached head only. 



4. homalonotus delphinocephalus. 



5. Ill^nus barriensis. 



