186 SILURIAN FOSSILS FROM ARISAIG, NOVA SCOTIA — AMI. 



No. of Species. 



Plantae 3 



Rhabdophora , 6 



Polypi 8 



Brachiopoda 44 



Lainellibranchiata 59 



Pteropoda 8 



Gasteropoda 9 



Cephalopoda 13 



Vermes 4 



(3stracoda 7 



Trilobita 6 



Merostomata 1 



Total -. . 163 



The species included in the above enumeration are all Silurian 

 (Upper Silurian), and represent horizons from the base of that 

 epoch to its summit, which, according to the New York and 

 Ontario system and equivalencies, would indicate from the 

 Medina to the Lower Helderberg, both inclusive, and according 

 to British nomenclature, include from the Llandovery to the 

 upper members of the Ludlow. 



It is but natural to point out here that, in examining the fauna 

 of these Arisaiff rocks, I have found a most intimate relation 

 existing between it and the fauna of rocks assigned to a similar 

 horizon in Europe along the Atlantic border. 



In fact, the intimacy may be said to be much closer between 

 the Arisaig fossils and those, for instance, of the Ludlow rocks 

 of Kendal, in Westmoreland, England, than with either the 

 Silurian rocks of Anticosti, of Ontario or of New York State. 



The following is a classified list of the organic remains collected 

 by Mr. T. C. Weston in 1886 in Divisions A, B, B', C and D of 

 the Arisaig Section, according to the late Rev. Dr. Honeyman 

 and Mr. Hugh Fletcher, B. A. 



It is hoped to supplement this catalogue shortly with full 

 descriptions of the new forms herein mentioned, and notes on 

 other interesting species, which are but little known or previously 

 unrecorded 



