220 Geological Survey of Canada. 



Margaritana rugosa.— South Nation River, Lacliine Canal and 

 St. Helen's Island. 



M. marginata. — Culbute and St. Helen's Island. 



M. arcuata (margaritifera). — Green and Rimouski Rivers, 

 Lake St. John and both the Matapediac Lakes. 



M. undulata. — Culbute, L'Original and St, Helen's Island. 



Anodouta subcylindracea. — Laehine Canal, Grand Lac about 

 10 miles south of Riraouski, a small lake G miles southwest of 

 of Grand Metis, Lakes Matapedia and St. John. 



A. pavonia. — Very abundant in the creek at L'Original and in 

 old quarries near the mile end toll-gate, Montreal. 



A. fluviatilis ? — Ottawa near L'Orignal and Laehine Canal. 



Cyclas sirnilis. — Very abundant in the creek at L'Original, 

 Laehine Canal, Metis Lakes and a pond 6 miles S. W. of Metis. 



C. Orbiculata. — St. Lawrence near Montreal. 



C. Dubia. — Ottawa City, Carillon, Montreal, Point Levi, Mare 

 Lake Anticosti, Eastern Townships, and throughout the eastern 

 peninsula of Lower Canada. 



Besides the above 128 species of recent shells occurring in 

 Canada, there are iu the collection of the Geological Survey 

 many more, the names of which have not yet been determined. 

 I hope to be able to give a list of these in a future number of 

 the Naturalist. Principal Dawson has kindly undertaken to 

 name the Tubicolae, Brvozoa, Foraminifera, &c, dredged on the 

 north coast of Gaspe, and will publish a list of them in another 

 number of this magazine. 



(To be continued.) 



ARTICLE XVII. — Geological Surveij of Canada. — Figures and 

 Descriptions of Organic Remains. Decades 1 and 4. 



Decade 1st is the work of Mr. Salter, the excellent paleonto- 

 logist of the Geological Survey of Great Britain, to whom, many 

 years since, Sir Wra. E. Logan committed a collection of the 

 remarkable silicified shells of Pauquette's Rapids on the Ottawa, 

 and who accordingly now describes these shells, acting, as he 

 says as pioneer for Mr. Billings. 



This decade commences very appropriately with the remarkable 

 and mysterious Maclurea Logani, a shell in which the name of 

 the father of American geology is associated with the greatest 

 name in Cana Iran geology ; but which the zoologists have yet 



