SILURIAN FOSSILS FROM ARISAIG, NOVA SCOTIA — AMI. 185 



VII. — Catalogue of Silurian Fossils from Arisaig, Nova 

 Scotia. By Henry M. Ami, M.A., F.G.S. 



(Read April 11th, 1S92. ) 



Tlirough the palseontological writings of Salter, Billings, Daw- 

 son, Honeyman, Hall and Jones — the fauna of the Silurian rocks 

 of Arisaig have been made widely known and notable both on 

 account of the alamdance and variety of its forms, as well as on 

 account of the remarkable continuity and unbroken sequence of 

 the strata from which these organic remains have been oljtained. 



In the Quarterly Journal of the Geological Society of London, 

 in the Canadian Naturalist, and Nova Scotian Institute of 

 Natural Science Transactions, as well as in the Reports of the 

 Geological Survey of Canada, the above-mentioned authors have 

 described and recorded numerous new, interesting and previously 

 unknown forms. 



During the season of 1886, Mr. T. C. Weston, accompanied by 

 Mr. J. A. Robert, made important collections of fossils in the 

 rocks constituting the stratigraphical series at Arisaig, along the 

 coast, in connection with the geological work entrusted by Dr. 

 Selwyn to Mr. Hugh Fletcher, and amongst them were several 

 new and hitherto unrecorded forms, besides good examples of 

 species which had been previously considered or doubtfully 

 identified. 



These collections, as well as others from Nova Scotia, having 

 been placed in my hands for determination during the season of 

 1886-87, I have applied myself to identify the various forms 

 present. 



Amongst the Arisaig collections alone I have been able to 

 recognise no less than 163 species, which are divisible into groups 

 as follows : — 

 4 



