5 GEORGE V. SESSIONAL PAPER No. 39b A. 1915 



IX. 



BRYOZOA OF THE GEORGIAN BAY REGION. 

 By H. T. White M.A., High School, Sudbury, Ont. 



The work upon which this paper is based was carried out at the Georgian Bay 

 Biological Station during the summers of 1911 and 1912, under the direction of 

 Dr. B. A. Bensley and Dr. E. M. Walker. I have been concerned chiefly with col- 

 lecting and identifying the species and with noting the habitats and variations 

 shown. 



At Go Home Bay, nine species and one variety were identified. This is double 

 the number reported from any other locality in North America. The Bryozoa are 

 pretty well distributed around the Georgian Bay, and most of the species are found 

 wherever suitable places occur. The relative abundance varies with the season 



It was found necessary to introduce certain changes in the classification of the 

 Plumatellas, as given by Kraepelin (1887) and Davenport (1904). Otherwise the 

 classification of those authors has been followed. The nomenclature has been 

 changed from that of the authors quoted, in accordance with the law of priority. 



The changes in the genus Plumatella were deemed necessary, because there were 

 as great differences between varieties of a species as between different species. For 

 that reason, Plumatella polymorpha Kraepelin has been divided into P. repens, P. 

 fungosa, and P. appressa. New variations in some of the characters of the species 

 have been noted. 



Comparatively little has been published concerning the Bryozoa of Canada. 

 In 1855, Goadby and Bovell published notes concerning a 'Plumatella' from Rice 

 Lake, Ontario. It evidently was Pectinatella. In 1880, Thomas Hincks published 

 some notes made by his father on 'a supposed Pterobranchiate Polyzoan' collected 

 in the Humber River near Toronto. According to Osier, this may have been Pectin- 

 atella. In 1883, Prof. William Osier, then at McGill University, gave an account 

 of a number of Bryozoa from Canada. He records Cristatella from several points 

 in Quebec, Pectinatella from Quebec and Ontario, and Plumatella arethusa, P. vitrea 

 and P. diffusa (probably = P. repens, P. punctata and P. emarginata, respectively) 

 from various localities. 

 Palvdicella articulata (Ehrenberg). (=ehrenhergii auct.) 



This is quite inconspicuous and may easily be overlooked. It occurs at Go 

 Home, Skerryvore, French River, Killarney and Waubaushene. 



Habitat very varied; under stones in rapid streams or fairly exposed shores, 

 or more protected places, e.g. bays and ponds. In the latter it is found under water- 

 lily leaves, or sticks. June to September. Common both in 1911 and 1912. 

 Fredericella sultana (Blumenbach) . 



The colonies are all small and the statoblasts few. The colonies present about 

 the same appearance throughout the season, as in the case of P. articulata. They 



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