OF CONCHOLOGY. 



325 



NOTICES AND REVIEWS 



OF 



NEAY CONCHO LOGICAL WORKS 



BY GEO. W. TRYON, JR. 



I.— AMERICAN. 



Index to Vols. I. to XI. of Observations on the Genus Unio, to- 

 gether with Descriptions of New Species of the family Uniouidce, 

 and Descriptions of New Species of Melanidse, Paludinae, Heli- 

 cidae, etc. By Isaac Lea, LL. D. 



The above title indicates sufficiently the contents of this very 

 valuable aid to the student of the Unionidse. Both Dr. Lea and 

 Dr. Jas. Lewis, of Mohawk, N. Y., the compiler of this work, 

 deserve the best thanks of malacologists for the thorough manner 

 in which their labor has been performed. 



The American Naturalist. No. V. September, 1867. 



Artificial Oyster cultivation in France. By F. W. Fellowes. 



Proceedings of the California Academy of Natural Sciences. III. 



Remarhible Instance of Vitality in a Snail. By R. E. C 



Stearns. 



The species mentioned is Helix Veatchii, which was discovered 

 to be living six years after it was collected. 



The West Coast Helicoid Land Shells. By J. G. Cooper, 

 M. D. 



This paper is an attempt at a new arrangement into sub- 

 genera of the terrestrial mollusca of the Pacific States. The 

 author rejects my genera, as adopted from Albers, in my mono- 

 graph of Terrestrial Mollusca, because " the types of these sub- 

 genera differ so much from our species, that it is easy to separate 

 the shells by good subgeneric characters ; and as they inhabit 



