OP CONCHOLOQY. 151 



** Shell finely striated, usually thin. 



f Secondary ridges easily distinguished from the 

 primaries, which are often obsolete. 

 1 Columella distinctly folded. 

 B. simplex, Ochotsk Sea. 



I Columella smooth, not distinctly folded. 

 B. cyaneum, North Atlantic from Greenland to Norway 

 and Northward, 

 ft Secondary ridges confounded, for the most part, 

 with the primaries. 

 | Longitudinal folds conspicuous. 

 B. Totteni, New Foundland, Fossil at Montreal. 



|| Longitudinal folds obsolete. 

 B. Humphrey sianum, Northern Europe, Greenland, Arctic 

 Ocean, near McKenzie's Eiver, Gulf of St. Law- 

 rence. 



The Canadian Naturalist and Geologist. New Series, II. No. 6. 

 December, 1865. 



Notes on some of the more Remarkable Genera of Silurian 

 and Devonian Fossils. BY E. BILLINGS. (Continued.) 



The present paper contains observations on the genus Bea- 

 tricea, which the author now believes to be neither a plant, as 

 at first supposed, nor a shell, as determined by Mr. Alpheus 

 Hyatt^ Jr.,* but a coral. 



Reprint of Conehologieal Papers, by isaac lea. Published in the 

 Proceedings of the Academy of Natural Sciences of Philadelphia. 

 From May, 1863, to May, 1865. 8vo. pamphlet, 32 pp. Philadelphia, 

 1866. 



This work contains descriptions of 138 new species of fresh 

 water shells, principally Unionidse and Strepomatidse. 



We have already noticed the papers and copied the names 

 and localities of the species on their first publication. The 

 present compilation is very useful for those interested in the 

 subject of Mr. Lea's labors, and its solid contents show his 

 unremitting activity and zeal in the study of our fiuviatile 

 molluscous fauna. 



Bulletin of the Mus. of Comp. Zool., No. 4. 8vo., 9 pp. Cam- 

 bridge, Mass. June, 1865. 



List of the Brachiopoda from the Island of Anticosti, sent 

 by the Museum of Comparative Zoology to different Insti- 

 tutions in exchange for other Specimens, with Annotations. 

 BY N. S. SHALER. 



* See this Journal, vol. i., p. 272. 



