232 Rqyort of the 



In Zoology Mr. Bell has given us the most complete list hitherto 

 published of the marine and fresh- water mollusks and radiates of 

 the St. Lawrence, beside a number of other facts, bearing on the 

 Zoology of that region. Mr. D'Urban has done a similar service 

 for the previously unexplored valley of the River Rouge. Both, 

 gentlemen, it is proper to state, are proteges of the head of the 

 Canadian Geological Survey, and have done these services to 

 science under his auspices. Dr. Gibb, of London, an old and 

 valued friend of the Societv, has contributed some curious notes 

 on the sounds produced by American insects; and Dr. Dawson 

 has presented to us a complete summary of the natural history of 

 the tubicolous marine worms of the Gulf of St. Lawrence, ani 

 the description of a new Canadian fish, the Gasterosteus gymnetes. 



Geology is a department always bkely to take an importaat 

 place in the labours of this Society, more especially as the officers 

 of the Geological Survey of Canada are among our most valued 

 and active contributors. In this sulject we have to notice three 

 papers by Prof. Dawson, one on the microscopic structures of 

 our Canadian limestones, and on the origin of these great sheets 

 of calcareous matter in the deposition of the comminuted frag- 

 ments of shells and corals, another in continuation of the Geology 

 of the tertiary deposits of the lower St. Lawrence, and a third 

 which for the first time brings the Silurian rocks of the peninsula 

 of Nova Scotia into comparison with those ot other parts of Ame- 

 rica. To this last paper. Prof. Hall, of Albany, has added des- 

 criptions of the new species of fossils, characteristic of these rocks. 

 Mr. Billings is, as usual, one of our most important contributors. 

 His papers on American Trilobites, on new genera of Brachiopo- 

 da, on the fossils of the Chazy Limestone, and on new species of 

 fossils from the middle and lower Silurian rocks of Canada, are 

 all steps in advance in Canadian palaeontology, of which any So- 

 ciety might be proud to be the medium. We have also to thank 

 Mr. Hunt for contributions to chemical Geology, which if not 

 first published by this society, have at least through its means 

 been more widely made known in Canada. Lastly, the series of 

 original papers for this session has been fitly closed by the very 

 interesting paper read by Sir W. E. Logan, at the April meeting 

 of the Society, on the extiaoidinary impressions recently found in 

 the Potsdam sandstone at Peith, C.W., constituting with the sin- 

 gular Protichnites, previously discovered by the same geologist, 

 some of the oldest and most wonderful traces of life preserved in 

 our Canadian rocks. 



