Ornithology^ — Technical terms. 



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to the extremities of the liiiige line, and is narrow, and partially formed by 

 both valves." The valves are almost equally convex, one being usually quite 

 flat, except near the beak, while the other is plano-convex at the beak and 

 slightly convex below. Subplaiia, flattened. 



It occurs in the Niagara shale, the most perfect specimens being found 

 adhering to the thin calcarous layers. 



The above descriptions, as well as the figures, are principally taken 

 from the second volume of that magnificent work, the Palaeontology of New 

 York. In this magazine there is not space to enter into elaborate details. 

 Our plan is to publish at first just so much as may serve to introduce each 

 species to the reader, and afterwards to give further particulars, with notices 

 of Canadian localities. The student must not be discouraged if after several 

 attempts he fails to recognise some of the species, but should rest assured 

 that by further application he will succeed. 



ARTICLE XX,— Ornithology ; Technical terms. 



The remarks made concerning the collection and examination of fossils 

 in our previous articles will apply also to birds. There are a few technical 

 terms to be acquired, and these will require only a few minutes study. The 

 best method of proceeding is to procure a specimen of some common species, 

 such as the Robin, and examine the plumage, book in hand. The advantage 

 of understanding the technical terms consists in this, that this knowledge will 



