PREFACE 



SESSIONAL PAPER No. 38a 



XIV. OHECK-LTST OF MARINE IXVERTEBTIATBS.— (Dr. E. M. Kindle and 



E. J. Whittaker, M.A.) 



The authors', in their list of over 1,000 invertebrates, occurring- along the Atlan- 

 tic shores of Canada, set forth the bathymetric range from between tide marks to a 

 depth of 100 fathoms — five graduations, namely, 100, 10O50, 50-15, and 15-1, and 

 inshore less than 1 fathom; also the minimum and maximum depths. 



They embody published faunal results from 1901, the date of Dr. Whiteave's 

 valuable and remarkable catalogue, published by the Geological Survey. To make 

 the contribution more complete a bibliography of fifty papers and memoirs follows the 

 check list, to which is added an alphabetical index, including synonyms. 



XY. HYDROGRAPHY IX PASSAMAQUODDY BAY AXD YICIXITY.— 



(Rev. Professor Alexander Vachox.) 



Professor Yachon made a series of observations during a number of cruises in 

 the Prince in the summer of 1915, and gives a summary with tables of his researches 

 into the temperature, salinity, and density of the sea-water at ten successive sta- 

 tions in July and August, at different hours, and at different stages of the tide. These 

 constitute the potent factors which affect the assemblages of marine org-anisms form- 

 ing the benthos, the. nekton, and the plankton, in the ocean. The investigations of the 

 author, involving lengthy laboratory studies, arc difficult to summarize, as the paper 

 itself is very much condensed. 



XYI. THE HYDROIDS OF EASTERX CAX^ADA.— Dr. C. McLean Eraser.) 



The author is able in this paper to extend substantially the list which he pub- 

 lished in 1913 — (a list of fifty Xova Scotia species) — and now determines 112 species, 

 sixteen for the first time in the area referred to, and one species which is regarded 

 as new to science. The distribution is tabulated, and an interesting summary of tiie 

 distribution of the Gymnoblastea. the Campanularida?, and five other orders. A sys- 

 tematic list, with distribution and synonyms, is given, and the author discusses the 

 principles of the classification of the hydroids, and combats Levinson's view that the 

 character of the individual (zooid), not the colony (zoarium), should determine the 

 classification, and the doubtful value of the operculum (urged by Levinson) as the 

 sole basis for dividing the Family Sertularidoe into genera is maintained, because it. 

 is so easily injured, and thus readily altered. 



