CONTENTS. 



Pakt 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 Lepetidse, 



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 Newcorab, 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. — Biuney's Puhiionata of North America. 



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



Advancement of Science. Annals and Magazine of 

 Natural History. Jeffreys' British Conchology. Wood- 

 ward's Manual of the Molhisca. 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 Conchyliologie. 



G^erman.— Malakozoologische Blatter. Pfeiffer's Mono- 

 graphia Heliceorum Viventium. Novitates Concholo- 



giCiE. 



APPENDIX, 



10. Catalogue of the Families Porcellanidse and Amphipe- 



rasidge, by S. R. Roberts, 189 



