182 Reviews — Canadian Palceontology. 



due chiefly to the continued expansion of the mining industries of 

 British Columbia, that province dividing the honours with the 

 Yukon District in the matter of gold. 



With this voluminous I'eport the volume concludes, and we hav& 

 only now to congratulate Dr. Dawson and his able staff on the 

 results of their labours as set forth with so much completeness and 

 wealth of detail. Arthur H. rooRD. 



11. — Contributions to Canadian Paleontology. Vol. IV, Part 1. 

 A Eevision of the Genera and Species of Canadian Palaaozoic 

 Corals. The Madreporaria Perforata and the Alcyonaria. 

 (Geological Survey of Canada.) By Lawrence M. Lambe, F.G.S. 

 Pages 1-96, plates i-v. (Ottawa, 1899.) 



A EEVISION of the Palaeozoic Corals has long been a desideratum. 

 Since the great works of Milne-Edwards and Haime, no 

 comprehensive treatise has been produced, though the labours of 

 De Frouientel, Lindstrom, Duncan, Hinde, Koch, and others in 

 Europe, and Plall, Billings, and Kominger in America, and 

 Nicholson on both sides of the Atlantic, have greatly extended our 

 knowledge of many groups. It need scarcely now be maintained 

 that to Nicholson science is deeply indebted for the initiation of 

 methods of study in this complicated group of organisms whereby 

 a fuller and more exact comprehension of their structure has been 

 acquired than was possible to the earlier workers in this field of 

 study. His work on the Palteozoic Tabulate Corals laid the 

 foundation upon which all subsequent investigators have built, and 

 the fact of his having made use of much American material gives 

 a peculiar value to his writings for those who have to deal with 

 the Palaeozoic Corals of that continent. 



In the work before ns the genera and species of the Canadian 

 Paleozoic Corals are redescribed, and "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 distinctive 

 structural peculiarities." Thus, as Rominger has observed ("Fossil 

 Corals of Michigan," 1876), Cambro - Silurian (Ordovician) and 

 Silurian species of Favosites have spiniform septa, while those of 

 the Devonian have squamulse. Again, it is found that the forms- 

 of Halysites of different geological horizons have distinctive 

 characteristics which are apparently constant. A table (at p. 74) 

 shows the distribution in time (from the Niagara to the Trenton), 

 with the physic&l characters — shape of corallites, size of their tubes,, 

 septation, tabulte, etc. — of Halysites catenidaria and six varieties^ 

 illustrating this point. 



With respect to distribution in time Favosites Gothlandica has- 

 a very wide one in Canada. It is recorded as occurring at many 

 localities in the Niagara, Guelph, and Lower Helderberg formations, 

 in divisions 2, 3, and 4 of the Anticosti Group, and in rocks of 

 supposed Hudson Eiver age at Stony Mountain, Manitoba. Its. 



