6-7 EDWARD VII. 



SESSIONAL PAPER No. 22a 



A. 1907 



Y 



THE DIATOMACE^ OF OANSO HAE.BOUE, NOVA SCOTIA. 



A PROVISIONAL LIST. 



By Dr. A. H. Mackay, Superintendent op Education for Nova Scotia. 



The following determinations of Diatomacece from Canso harbour were made from 

 collections taken on September 10, 1902, just before leaving the Marine Biological 

 Laboratory of Canada for the second and last time during the season. One collection 

 was from the scrapings and washings of Zoster a marina L. in the shallow water near 

 the laboratory, the other from the drippings and washings of Chorda filum L. a few 

 hundred yards to the east of the laboratory. In addition I was given a small vial of a 

 schizonematous diatom growing in minute gelatinous colonies which mimic minute 

 species of ectocarpus, &c., collected by Mr. C. B. Kobinson on the piles of some of the 

 wharves. 



As my previous studies of the Diatomacece were confined to those found in fresh- 

 water deposits, I required more time than I could afford to make a complete study of 

 the rarer species in the collections before the date given me to complete my report. In 

 addition I had the misfortune to be accidentally without any lens of higher power 

 than a one-twelfth inch oil immersion, so that I was unable to make out some of the 

 finer details necessary to determine some of the species, or to measure the number of 

 striae when more numerous than fifteen to ten microns. 



My reference authorities are as follows : 1. ' Diatomaceen Typen-Platte,' No. 

 484 of J. D. MoUer, Wedel in Holstein, April, 1878, containing about 400 types. 2. A. 

 Schmidt's ' Atlas de Diatomaceenkunde,' up to plate 160. 3. George Karsten's ^ Die 

 Diatomeen der Kieler Bucht.' 4. Rabenhorst's ' Flora Europsea Algarum Aquse Dulcis 

 at Submarinae.' 5. Van Heurck's ^ Synopsis (et Atlas) des Diatomees de Belgique.' 

 G. Peragallo's ' Diatomees Marines de France,' in ' Le Micrograph Preparateur ' to 

 date. 7. Wolle's ' Diatomacese of North America.' 8. * Le Diatomiste,' volumes I. 

 and II., 1890 to 1896. 9. ' Diatomees Fossiles du Japon ' by Brun of Geneva and 

 Tempere of Paris. 10. ' Diatomees des Alpes et du Jura et de la Eegion Suisse et 

 Francaise des Environs de Geneve,' par J. Brun. 



A fewi plankton forms were taken in the collections and also some fresh-water 

 species. But from the Chorda filum the great mass consisted of Striatella unipuncta 

 Ag. and Licmophora Lynghyei (Kg.) Grun., forming more than 90 per cent probably 

 of the whole mass of diatomaceous material. Several species were seen but lost before 

 determination. I, therefore, present the following list as a provisional one ; and propose 

 to still further examine the material from Canso, and to supplement it by a study of 

 the Diatomacece of Halifax harbour, which I am in a position to be able to explore 

 with more convenience. 



The dimensions — length and breadth of valve — are given in microns, which for 

 the sake of compactness are expressed simply in figures. Likewise, the number of 

 striae, ribs or rows of pearls in 10 microns are given in figures simply. 



provisional list. 



1. Amphora (?). 



2. Oymbella (?). 



3. Stauroneis anceps Ehr., 18 x 6. One specimen. 



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22a— 6J 



