GEOLOGICAL SURVEY OF CANADA. 



CONTRIBUTIONS TO CANADIAN PALEONTOLOGY. 



VOLUME IV. 



Part T. 



A REVISION OF THE GENERA AND SPECIES OF CANADIAN 

 PALEOZOIC CORALS. 



The Madreporaria Perforata, and the Alcyonaria, 



BY 



LAWRENCE M. LAMBE. 



The following pages consist of a revision of the genera and species of 

 Canadian Palaeozoic corals, with as complete a description as possible of 

 their structural characteristics. The classification of the corals in the 

 first volume of Nicholson and Lydekker's Manual of Palaeontology has 

 been for the most part adhered to and, in most cases, original descriptions 

 of the genera and species, as the writer understands them, have been 

 prepared. As far as the material available will permit, the various genera 

 of the Madreporaria Perforata are taken up in order and later those 

 of the Alcyonaria. At a future time it is hoped to complete a revision of 

 the Actinozoa by a similar treatment of the remaining sections of the 

 Zoantharia. It is attempted to show that some forms hitherto considered 

 of little value as regards the determination of the age of the deposits in 

 which they occur, on account of their wide range in geological time, are 

 capable of indicating definite horizons through the possession of distinc- 

 tive structural peculiarities. The advances made in paleontology of 

 recent years and the new light thrown on some doubtful points of struc- 

 tural detail, through the medium of additional and sometimes better 

 preserved material, have either necessitated the removal of some species 

 to different genera or have strengthened others in the positions already 

 assigned to them. 



All the fossils mentioned in the following pages with few exceptions 

 are in the collection of the Geological Survey Department at Ottawa 

 and are the result of many years collecting in all parts of the Dominion 

 by officers of the Survey. 



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