CONTEHSfTS. 



PAGE 



1. Descriptions of New Species of Par tula, Inhabiting the Ta- 



hitian Archipelago, bj- W. Harper Pease 193 



2. Remarks on Nudibranehiata inhabiting the Pacific Islands, 



with Descriptions of two New Genera, by W. Harper Pease. 204 



3. Descriptions of Achatinellae, by Wesley Newcomb, M. D 209 



4. Monograph of the Terrestrial Mollusca of the United States, 



by George W. Tryon, Jr 218 



1. Preface. 



2. Introduction. 



3. Descriptions uf Species. 



4. Reference to Plates and Synonymy. 



:"-. Descriptions of American Fresh-water Stieils, by T. A.Conrad. 278 

 6. Descriptions of New Marine Bivalve Shells, by T. A. Conrad.. 280 



EDITOR'S TABLE. 



Reviews 283 



1. American. — Proceedings of the Essex Institute.— Transactions of the Acad- 

 emy of Science of St. Louis.— Annals of the New 'i'ork Lyceum of Natural 

 History. — Brown's Catalogue of Shells.— Note on the affinities of Bellero- 

 phontidae, by P. B. Meek." 



3. Foreign.— T-a,te's Land and Fresh-water Mollusks of Great Britain.— Con- 



chologia Icouica, etc. 

 Obituary 288 



Cantraine, Poulson. 



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