im 



ON THE OCCURRENCE OF ASAPHUS MEGISTOS. 



There are some specimens in whicli tlie expansions occur at inter- 

 vals of less than one line, and they are even so close together that 



T^fM% 



Fig. 29. Haimeophyllum ordinatum. 



the coral appears at first sight to be a large sub-globular mass of 

 concentric laminse. I do not at present think these can be separated 

 as a distinct species from those with expansions one or two lines 

 distant. 



Locality and Formation. — Township of Walpole. Corniferous 

 limestone. 



NOTE ON THE OCCURRENCE OF ASAPHUS MEGISTOS IN 

 CANADIAN ROCKS, WITH ADDITIONAL REMARKS ON 

 ASAPHUS HINCKSII. 



BY E. J. CHAPMAN, 



PEOFESSOE OF MINEEAIiOGT AND GEOLOGY, UNIVEESITT COLLEGE, TOEONTO. 



In the last No. of the Canadian Journal we published a brief 

 description of a new species of Asaphus, A. Hincksii — the fourth 

 species of that genus recognised in the Lower Silurian rocks of Canada. 

 Mr. Billings, of the Geological Survey, has subsequently had the kind- 

 ness to place in our hands, for examination, a specimen of a trilobite 

 discovered som^etime ago in the Trenton Limestone of Cobourg, C."W., 

 by Mr. J. F. Smith of Toronto, This species, as suggested by Mr. 

 Billings, proves to be identical with the A. megistos (of Prof. Locke) 

 from the Trenton Limestone of Ohio. Still more recently. Sir 

 William Logan has kindly lent us a second example of the same 

 species, discovered at Cobourg, and presented to him by — Blackwell, 

 Esq. These examples differ from the figure given by Prof. Locke 



