IV. CONTENTS. 



Part 2— April 1st, 1866. 



I. Further Observations on Mr. Gabb's Palaeontology of 



California. By T. A. Conrad 97 



2. Observations on Recent and Fossil Shells, with proposed 



new Genera and Species. By T. A. Conrad 101 



3 . Descriptions of new Species of Tertiary, Cretaceous and 



Recent Shells. By T. A. Conrad 104 



4. Description of a new Species of Unio. By T. A. Conrad... 107 



5. Description of a new Species of Vivipara. By George W. 



Tryon, Jr 108 



6. Descriptions of new Fluviatile Mollusca. By George W. 



Tryon, Jr Ill 



7. Observations on an Abnormal Specimen of Physa gyrina. 



By George W. Tryon, Jr 114 



8. Monograph of the family Strepomatidae, (concluded. J By 



George W. Tryon, Jr 115 



9. Note on the Lingual Dentition of the Strepomatidse. By 



George W. Tryon, Jr 134 



10. Remarks on the Origin and Distribution of the Opercu- 



lated Land Shells which inhabit the Continent of 

 North America and the West Indies, (continued.) By 

 Thomas Bland 136 



II. Descriptions of new American Fresh- water Shells. By 



John G. Anthony 144 



EDITOR'S TABLE. 



Reviews and Summary of Conchological Publications 148 



American. — Review of the Northern Buccinums, by Dr. Wm. Stimp- 

 son. — Reprint of Conchological Papers, by Isaac Lea. — List of 

 Brachiopoda from the Island of Antieosti, by N. S. Shaler.— Stimp- 

 son's Researches upon the Hydrobiinaa. — Proceedings of the Acad- 

 emy of Natural Sciences of Philadelphia.— Morse's new Species of 

 Pupada?.— Notes on Terrestrial Mollusca, with Descriptions of new 

 Species, by Thomas Bland. — Reperterio fisico-natural de la Isla 

 de Cuba. 



Foreign.. — Conchologia Iconica. — Further Reports on Shetland 

 Dredgings, by J. Gwj r n Jeffreys. — Transactions of the Linnasan 

 Society. — British Conchology, Vol. 3, by Jeffreys. 



Malacologied'Aix les Bains, Monographic du genre Paladilhia, et Moit- 

 essieria, Mollusques de la Sahara, by J. R. Bourguignat. — Journal 

 de Conchyliologie. — Revue et Magazin de Zoologie. — Malacologie 

 de la Grande-Chartreuse, by Bourguignat. — Malacologie de l'Al 

 gerie, by Bourguignat. — Bulletin de 1'Academie Imp. des Sciences 

 de St. Petersburg. — Annales des Sciences Naturelles. 



Monographia Pneumonopomorum Viventium. — Ueber die Familie der 

 Rissoiden, by Mohrenstern. — Novitates Conchologicre, by Pfeiffer, 

 Dunkerand Romer. — Archiv. fur Naturgeschichte. 



Ofversigt af Kongl. Vetenskaps Akademiens Forhandlingar, &c. 



Scientific Intelligence 179 



On the Anatomy of Tridacna elongata, by Leon Vaillant. — On the 

 correct Application of Certain Terms used in the Description of 

 Shells, by A. A. Gould, M.D. — Curious Distortion in the Shell of 

 Physa heterostropha. — Remarks on the Habits of Spinalis Flem- 

 ingii, by Alex. Agassiz. — Collection of Shells for Sale. — Report of 

 the Conchological Committee of the Academy of Natural Sciences. 

 — Address of the Building-tund Committee of the Academy of Na- 

 tural Sciences, &c. 



