CONTENTS OF VOL. XIX. 



Page. 

 General Meeting, October 4, 1876. . k . . . . 1 

 Mr. C. S. Minot. The close relationship between Worms and Verte- 

 brates ... 4 ........ 1 



General Meeting, October 18, 1876 2 



Dr. T. Sterry Hunt. The Quebec Group in Geology ... 2 



Section of Entomology, October 25, 1876 4 



Mr. E. P. Austin. On the species of Sunius and Psederus found in the 



United States 4 



General Meeting, November 1, 1876. . . . ... 11 



Election of Associate Members ......... 11 



Prof. A. Hyatt. The Embryology of Sponges 12 



General Meeting, November 15, 1876. ...... 17 



Mr. C. S. Minot. On the Classification of the Lower Worms ... 17 



General Meeting, December 6> 1876 26 



The President. Remarks on the death of Mr. Edward Pickering . . 26 

 Mr. Samuel H. Scudder. A Century of Orthoptera. Decade VII. 



Acrydii .27 



New forms of Saltatorial Orthoptera from the Southern United 



States .35 



Baron C. R. Osten SackeN. Report on the Diptera brought home by 



Dr. Bessels from the arctic voyage of the " Polaris " in 1872 . 41 



Mr. William H. Dall. Note on " Die Gasteropoden Fauna Baikalsees " 43 



Dr. W. G. Farlow. On certain Algas in Horn Pond, Woburn . . 47 



General Meeting, December 20, 1876 47 



Rev. George F. Wright. Some remarkable Gravel Ridges in the Mer- 

 rimack Valley (Plates 1-3) .47 



Prof. C. H. Hitchcock. Lenticular Hills of Glacial Drift ... 63 



General Meeting, January 3, 1877 68 



Mr. J. H. Emerton. A Comparison of the Spiders of Europe and 



North America 68 



Dr. H. A. Hagen. Remarks on the occurrence of White Ants in the 



West and North-West 72 



Extract from a letter by Baron Osten Sacken on the Species of Ter- 



mes found by him in California 72 



Note by Dr. Hagen 73 



Letter from Mr. H. S. Treherne 74 



