282 AMERICAN JOUKNAL 



NOTICES AND REVIEWS 



OF 



NEW CONCHOLOGICAL WORKS 



BY GEO. W. TRYON, JR. 



I.— AMERICAN. 



Jbservations on Polyzoa, sub-order Phytactolaemata ; by Alpheus 

 Hyatt. (From Proc. Essex Institute.) 8 vo. ( 103 pp., 9 plates. Essex, Mass., 

 1866-8. 



This is a very complete treatise on the anatomy and classifi- 

 cation of the fresh-water Polyzoa — minute animals that Con- 

 chologists have alternately claimed and disowned as Mollusks 

 so frequently that it must surely puzzle the little fellows them- 

 selves to tell where they do belong. 



As Mr. Hyatt informs us, " Dr. Leidy is the sole authority 

 upon this subject in America," and we do not pretend to criti- 

 cize upon a subject of which we are entirely ignorant. Dr. 

 Leidy, however, informs us that the subject has been very care- 

 fully and thoroughly studied by the author, and that the 

 work is an important contribution to our knowledge of these 

 animals. 



Several new species are described. 



Proceedings of the Academy of Natural Sciences of Philadelphia. 



No. 3. June — August, 1868. 



Descriptions of Seven New Species of Unio from North 

 Carolina. By Isaac Lea. 



U. dorsatus, datus, Beaverensis, nubilns, Pawensis, humerosus, 

 genuinus. 



Description of Two New Species of Unionidos from Equa- 

 dor. By Isaac Lea. 



Unio Ortoni, Anodonta Napoensis. 



