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ROYAL SOCIETY OF CANADA 



As bearing upon thi-^ point, and showing which are the typical 

 species of this luuna, 1 give u Hst of the genera witli the number of in- 

 dividuals of each found on the slabs and fragments placed in my hands 

 by -Mr. Walker, and giving the horizon where related species or genera 

 are found. 



Genera of the Mount Stephen Fauna showing the comparative num- 

 ber of individuals and the horizon where related species or genera are 

 found. 



Agnostus and Ptychoparia. — These are the onl}- types present in this 

 fauna that are typical Paradoxides-zone genera. But as they range up 

 into the Ordovician they are of no value for exact correlation. If we 

 should be guided by species-marks the Agnostus is a Limbatus of Upper 

 Cambrian type, since the lateral spines of the pygidium are wanting. 

 Of Ptychoparia it may be said that it is not found in any fauna below 

 Paradoxides, otherwise as a genus it is of no value for comparing Cam- 

 brian faunas with each other. 



Corynexochus and Dolichometopus. — These two genera are so far 

 known only from the Upper Paradoxides beds. The tirst, judging from 

 the record, is rare in Sweden ; it is scarce at Mount Stephen. The 

 Dolichometopus in the closeness of the eye-lobe to the glabella shows an 

 advance in development beyond the other two species known, and there- 

 fore it may be inferred that it came somewhat later in time. 



Dorypyge. — This type heretofore has been referred to the Upper 

 Paradoxides beds. It is there that Dr. Dames placed it after a review 

 of the Chinese Cambrian fauna, in which it was tirst recognized. It was 

 at this horizon too that the author found it in the Cambrian terrane near 



