CONTENTS. 



Part 3— February 3, 1870. 



Page. 



1. Record of Meetings, ...... 117 



2. On the Pterocerae of Lamarck, and their Mutual Rela- 



tions, by Theodore Gill, M.D., . . . .120 



3. Materials for a Monograph of the Family Lepetidae, 



by Wm. H. Dall, 140 



4. On the Land and Fresh- Water Mollusca of Nicaragua, 



by Ralph Tate, 151 



5. Descriptions of New Species of Marine Mollusca, by 



Wesley Newcomb, M.D., 163 



6. Description of a New American Helix, by Wesley 



Newcomb, M.D., 165 



7. Catalogue of the Shells of the Coosa River, Alabama, 



by James Lewis, M.D., ..... 166 



8. Descriptions of New Species of Marine Bivalve Mol- 



lusca, in the Collection of the Academy of Natural 

 Sciences, by George W. Try on, Jr., . . . 170 



9. Notices and Reviews of New Conchological Works, by 



George W. Tryon, Jr., 173 



I. American. — Binney's Pulmonata of North America. 



II, Foreign. — British. — Reports of the British Assoc, for the 



Advaucement of Science. Annals and Magazine of 

 Natural History. Jeffreys' British Conchology. Wood- 

 ward's Manual of the Mollusca. Conchologia Iconica. 



French. — Cat. des Mollusques des Mers d'Europe, par Pe- 

 tit de la Saussaye. Faune Malacologique de Belgique, 

 par F. de Malzine. Journal de Couchyliologie. 



German. — Malakozoologische Blatter. Pfeiffer"s Mono- 

 graphia Heliceorum Viventium. Novitates Concholo- 

 gicag. 



APPENDIX. 



10. Catalogue of the Families Porcellanidae and Amphipe- 



rasidse, by S. R. Roberts, 189 



