ADDITIONS TO THE LIBRARY. 239 



Vienna. Kaiserlich-konigliche zoologisch-botanische Gesellschaft. 

 Yerhandlungen. 1891. Band xli. Quartal 1-4. 1891. 



Warwick. Warwickshire Natural History and Archaeological 

 Society. Fiftieth Report, 1892. 1892. 



Washington. Geological Society of America. Bulletin. Yol. i. 

 1890. 

 J. Hall. Some suggestions regarding the sub-division and grouping of 

 the species usually included under the generic term Orthis, in accordance 

 with external and internal characters and microscopic shell-structure, 19. 

 — J. Hall. On new genera and species of the family DictyospongidaB, 22. 

 -G. K. Gilbert. The strength of the Earth's crust, 23.— T. C. Cham- 

 berlin. Boulder belts distinguished from boulder trains — their origin and 

 significance, 27. — J. F. Kemp. On the trap dikes near Kennebunkport, 

 Maine, 31. — P. Neff. The Sylvania Sand in Cuyahoga County, Ohio, 

 32. — J. P. Dana. Areas of Continental progress in North America and 

 the influence of the conditions of these areas on the work carried forward 

 within them, 36. — C. D. Walcott. Study of a line of displacement in the 

 Grand Canon of the Colorado, in Northern Arizona, 49. — J. W. Spencer. 

 The High Continental elevation preceding the Pleistocene Period, 65. — 

 J. W. Spencer. Ancient shores, boulder pavements, and high level 

 gravel deposits in the region of the Great Lakes, 71. — E. Orton. Origin 

 of the Rock Pressure of Natural Gas in the Trenton Limestone of Ohio 

 and Indiana, 87. — J. C. Russell. Notes on the Surface Geology of 

 Alaska, 99. — A. C. Lawson. Note on the Pre-palseozoic surface of the 

 Archaean Terranes of Canada, 163. — A. C. Lawson. The Internal Rela- 

 tions and Taxonomy of the Archaean of Central Canada, 175. — W. M. 

 Davis. Structure and origin of Glacial Sand Plains, 195. — C. R. Van 

 Hise. The Pre-cambrian Rock of the Black Hills, 203. — S. F. Emmons. 

 Orographic movements in the Rocky Mountains, 245. — R. Bell. On 

 Glacial Phenomena in Canada, 287. — Sir J. W. Dawson and D. P. Pen- 

 hallow. On the Pleistocene Flora of Canada, 311. — C. I). Walcott. 

 The value of the term '^ Hudson River Group " in geologic nomenclature, 

 335. — A. Winchell. Some results of Archaean Studies, 357. — J. B. 

 Tyrrell. Post-tertiary deposits of Manitoba and the adjoining territories 

 of North-western Canada, 395. — J. S. Diller. Sandstone Dikes, 411. — 

 N. S. Shaler. Tertiary and Calcareous Deposits of Eastern Massachu 

 setts, 443.— R. W. Ells. The Stratigraphy of the " Quebec " Group 

 453. — T. C. Chamberlin. Some additional evidences bearing on the 

 interval between the Glacial Epochs, 469. — H, S. Williams. The 

 Cuhoides Zone and its Fauna, 481. — E. Brainerd and H. M. Seeley. The 

 Calciferous Formation in the Champlain Valley, 501. — R. P. Whitfield. 

 The Fort Cassin Rocks and their fauna, 514. — J. S. Newberry. The 

 Laramie Group, 524. — G. H. Williams. Note on the Eruptive Origin 

 of the Syracuse Serpentine, 533. — W. B. Clark. On the Tertiary 

 Deposits of the Cape Fear River Region, 537. — R. G. McConnell. Gla- 

 cial Features of Parts of the Yukon and Mackenzie Basins, 540, — G. F. 

 Wright. A Moraine of Retrocession in Ontario, 544. — W. J. McGee. 

 The Southern Extension of the Appomattox Formation, 546. — G. H. 

 Williams. Geological and Petrographical observations in Southern and 

 Western Norway, 551. — D. White. Cretaceous Plants from 3Iartha's 

 Vineyard, 554. — C. H. Hitchcock. Significance of oval Granitoid Areas 

 in the Lower Laurentian, 557. — B. K. Emerson, I*orphyritic and 

 Gneissoid Granites in Massachusetts, 559. — F. L. Nason. On the Intru- 



