VI. CONTENTS. 



Part 4— October 1st, 1866. 



1. Descriptions of New Species of Land Shells inhabiting 



Polynesia. By William Harper Pease 289 



2. A Well-abused Mollusk. By H. Crosse. (Translated by 



Frank Daulte 294 



3. Description of a New Species of Columna. By George W. 



Tryon, Jr 297 



4. Descriptions of New Species of Melaniidss and Melano- 



pidse. By George W. Tryon, Jr.... 299 



5. Description of a New Species of Septifer. By George W. 



Tryon, Jr 302 



C. Description of a New Species of Helix. By George W. 



Tryon, Jr 303 



7. On the Terrestrial Mollusca of the Guano Island of 



Navassa. By George W. Tryon, Jr 304 



8. Monograph of the Terrestrial Mollusca of the United 



States. (Continued.) By George W. Tryon, Jr 306 



9. On a Species of Helix from California, supposed to be 



New. By William H. Dall 328 



10. Descriptions of Three New Species of Land Shells from 



Arizona. By William M. Gabb 330 



11. On the Acmseidee of the Vancouver and California pro- 



vince. By P. P. Carpenter 332 



12. Remarks on the Distribution of the Inoperculated Land 



Shells which inhabit the Continent of America and 

 the West Indies. By Thomas Bland 349 



13. Descriptions of New Species of North American Land 



Shells. By Thomas Bland 371 



EDITOR'S TABLE. 



Reviews and Summary of Conchological Publications 375 



American. — Conchological Notes, by Dall. — Proceedings of the Philadel- 

 phia Academy of Natural Sciences. — American Journal of Science 

 and Arts. 



Foreign. — Proceedings of the Zoological Society, London. — Conchologia 

 Iconica, by L. Reeve. 



Journal de Conchyliologie. 



Scientific Intelligence 384 



Museum of Comparative Zoology, at Cambridge, Mass. — Building 

 Fund of the Academy of Natural Sciences, &c 



ILLUSTRATIONS. 



Portrait of Thomas Bland, with Autograph. 

 Two Colored and Two Plain Plates. 



