CONTENTS OF VOL. XVIII. 



Annual Meeting, May 5, 1875 1 



Prof. A. Hyatt. Custodian's Report 1 



Edw. Pickering. Treasurer's Report 14 



Officers of the Society for 1875-6 15 



F. W. Putnam. On the Habits of the Blind Crawfish, and the Repro- 

 duction of Lost Parts 16 



H. A. Hagen, M.D. Synopsis of the Odonata of America 20 



General Meeting, May 19 96 



Prof. William B. Rogers. On the Newport Conglomerates .... 97 

 On the Gravel and Cobble-stone Deposits of 



Virginia and the Middle States .... 101 



General Meeting, June 2 106 



T. Sterry Hunt, LL.D. The Decayed Gneiss of Hoosac Mountain . . 106 



Prof. J. D. Dana on the Alteration of Rocks . 108 



General Meeting, June 16 . 113 



S. H. Scudder. On Fossil Insects from Cape Breton . 113 



H. K. Morrison. Notes on the Noctuidae 114 



Prof. N. S. Shaler. On the Motion of Continental Glaciers .... 126 



General Meeting, October 6 133 



C. R. Osten Sacken. Diptera from the Island Guadalupe 133 



On the North American Species of Syrphus . . 135 

 Capt. Charles Bendire. Notes on the Birds observed near'Camp Har- 

 ney, Oregon ....". 153 



W. J. Hoffman, M.D. List of Birds observed at Grand River Agencv, 



Dakotah '.169 



Prof. N. S. Shaler. On the Cause and Geological Value of Variation 



in Rainfall 176 



S. H. Scudder. Post-Pliocene Fossils from Sankoty Head, Nantucket . 182 

 William Denton. On an Asphalt Bed near Los Angeles, Cal., and its 



contained Fossils 185 



General Meeting, October 20 187 



Dr. T. D wight, Jr. Report on the Wyman Anatomical Collection . 187 



Section of Entomology, October 27 188 



S. H. Scudder. On the Butterflies of Cape Breton Island 188 



General Meeting, November 3 . . . • 190 



Prof. C. H. Hitchcock. Remarks on the Cambrian and Cambro-Silurian 



Rocks of Western Vermont 191 



General Meeting. November 17 193 



W. K. Brooks, Ph.D. Embryology of Salpa (with Plate I) .... 193 



Prof. J. D. Dana. On Metam'nrphi'sra and Pseudomorphism 200 



Section of Entomology, November 24 201 



B. P. Mann. Monstrosities in Anisopteryx vernata 201 



