CONTENTS OF VOLUME 11. 



I. Volcanic Manifestations in New England. By Win. T. Brigham. (Published Febru- 

 ary 17, 1871) 1 



n. Early Stages op Terebratulina. Plates 1, 2. 13y Prof. Edward S. Morse. (Published 



September 1, 1871) ' 29 



m. Osteology and Myology of Didelphys virginiana. By Elliot Coues, 31. D., TJ. S. A. 



With an Appendix on the Brain. By Jeffries Wyman, M.D. (Published Mny 1, 1872.) 41 

 IV. Development op Li.mulus Polyphemus. Plates 3-5. By A. S. Packard, Jr., 3LD. (Pub- 

 lished April 9, 1872) 155 



V. Description of Bal^noptera musculus, in the possession of the Society. Plates 6, 7. 



By Thomas Dioight, Jr., M.D. (Published October 31, 1872) 203 



VI. Fossil Mtriapods from Nova Scotia. By S. U. Scudder. (Published July 24, 1873) . 231 

 VII. Note additionelle au Memoire intitule "Volcanic Manifestations in New England." 



Par 31. Albert Lancaster. (Published January 1, 1874) 241 



VIII. Embryology of Terebratulina. Plates 8, 9. By Prof. Edward S. 3Iorse. (Published ^.u 



December 17, 1873) 



IX. List op the Birds op Western Mexico. By George Nl Bawrence. With Notes on 



THEIR Habits, etc. By Col. A. J. Grayson. (Published April 25, 1874) .... 265 

 X. Recent Changes of Level on the Coast of Maine. By Prof JSf. S. Shaler. (Published 



October 7, 1874) * 320 



XI. The Species op the Lepidopterous Genus Pamphila. Plates 10, 11. By Samuel II. 



Scudder. (Published December 16, 1874) 341 



XII. Antiquity of Caverns and Cavern Life op the Ohio Valley. Plate 12. By Prof iV 



S. Shaler. (Published March 24, 1875) ." . 355 



XIII. Monograph of the TABANioiE, Part i. By C. B. Osten SacJcen. (Published April 23, 



1875) 365 



XIV. Revision of North American PoRiFERiE, Part i. Plate 13. By A. Hyatt. (Published 



September 29, 1875) 399 



^ XV. Gynandromorphism in Lepidoptera, By A. S. PacJcard, Jr., 3LD. Plate 14, figs. 1, 2. 



(Published October 13, 1875) " . .409 



• XVI. Structure and Transformations of Eum.eus Atala. Plato 14, figs. 3-17. By Samuel 



H. Scudder. (Published October 13, 1875) 409 



XVII. Monograph op the TabanidjE, Part ii. By C. B. Osten Sacken. (Published April 20, 



1876) 421 



" XVin. Monograph of North American Porifer^, Part ii. Plates 15, 16, 17.. By Prof. A. 



Hyatt. (Published June 8, 1877) 481 



■^ XIX. Monograph op the Tabanid.f,. Supplement. By C. B. Osten Sacken. (Published Marcli 2, 



1878) ■ .555 



XX. Fossil Myriapods prom Nova Scotia. Supplement. By Samuel U. Scudder. (Published 



March 2, 1878) 561 



IxDEx 563 



Errata 567 



