764 



SCIENCE 



[N. S. Vol. XXVII. No. 698 



derived from Zeuglodonts, and that their 

 origin is not at present known; also that 

 the white whale and the narwhal should 

 not be removed from the family Delphin- 

 idffi, and that the river dolphin, steno- 

 delphis, should, for the present at least, be 

 placed in that family. 



Results of the American Museum Explora- 

 tion in the Fayum Desert of Northern 

 Egypt: Henky F. Osborn, president of 

 the American Museum of Natural His- 

 tory. 



Professor Osborn gave an account of the 

 American Museum expedition into the 

 Payiim Desert in search of the ancestors 

 of the elephant. The formations explored 

 were Middle and Upper Eocene. Bradnell 

 and Andrews, between 1901 and 1905, had 

 explored the region, finding ancestral forms 

 of the Proboscidea and of the Hyracoidea, 

 as well as primitive Sirenia and Zeuglo- 

 donts. The camp of the American Museum 

 expedition was located to the west of Qasr 

 el Sagra, near the bone quarries opened by 

 Bradnell. Eemains of Arsino'itherium, 

 PalcEOmastodon and Mceritherium were ob- 

 tained from these quarries. A reconnois- 

 sance into the Zeuglodon Valley, near Gar 

 el Gehannem, was described. The restora- 

 tions of Mceritherium and Palceomastodon, 

 made by Mr. Charles R. Knight, under the 

 direction of Professor Osborn, were exhib- 

 ited. From northern Africa the elephant 

 stock migrated south through Africa, north 

 into Europe, and northeast and east 

 through Asia into the Americas. From a 

 comparison of the ancestral elephant Mceri- 

 therium, with the Sirenian Eotherium, it 

 is believed that the sea cows and the ele- 

 phants are derived from the same stock. 



Additional Notes on the Santa Cruz -Typo- 

 theria: W. J. Sinclair, of Princeton 

 University. 



A presentation of the general conclu- 

 sions reached, as a result of two years' 



study of the Typotheria from the Santa 

 Cruz formation of Patagonia. They ap- 

 pear first in the Notostylops beds (upper- 

 most Cretaceous or basal Eocene) and be- 

 come extinct in the Pampean (Pleistocene). 

 It is generally assumed that the rodents 

 and conies are related to Typotheria, but 

 this does not appear to be the case, the 

 resemblances are probably due to converg- 

 ence. The Toxodontia and the Typotheria 

 probably had a common origin. The 

 Typotheria do not lend much support to 

 the idea of a former land connection with 

 Africa, showing no relationship with the 

 recently discovered Eocene mammals from 

 the Fayiim province of Egypt. 



Stratigraphic Observations in the Vicinity 

 of Susquehanna Gap, north of Harris- 

 hurg, Pa.: Gilbeet van Ingen, of 

 Princeton University. 

 Details the results of field work that 

 Professor Van Ingen has been carrying on 

 along the Susquehanna River, above Har- 

 risburg. The formations are found to con- 

 tain well-preserved fossils and several 

 typical faunas, as, for instance, the Hamil- 

 ton, Ithaca, etc., are well developed. The 

 findings of the author do not always agree 

 with those of the Second Geological Survey 

 of Pennsylvania, even in regard to struc- 

 ture, a great thrust fault recognized by 

 the author, for example, has rendered the 

 section incomplete, a fact not noted by 

 the survey. 



Further Researches on the Physics of the 

 Earth, and especially on the Folding of 

 Mountain Ranges and the UpUft of 

 Plateaus and Continents, produced hy 

 Movements of Lava beneath the Crust, 

 arising from Secular Leakage of the 

 Ocean Bottom: T. J. J. See, U. S. Naval 

 Observatory, Mare Island, Cal. (Read 

 by title.) 



Progress in the Demarcation of the Bound- 

 ary between Alaska and Canada: 0. H. 



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