24G ANNALS NEW YORK ACADEMY OF SCIENCES 



Douglas W. Johnson, The Stkategic A^alue of Landforms in the 



Geeat Russian Eeteeat, 

 A. W. Grabau, Some Paeallelisms in the Geology of AVest- 



EKN EirEOPE AND AmEEICA. 



Summary of Papers 



Dr. Johnson described and illustrated b_y specially prepared maps how 

 the detailed movements in the Russian retreats of 1915 were influenced 

 to a remarkable degree by the surface features of the country over which 

 the contending armies moved. 



Professor Grabau, with the aid of charts and lantern slides, contrasted 

 the topographic, sedimentary and faunal relations of the British Isles 

 and western Europe, particularly the Baltic region during the Tremadoc, 

 Aremg and Landeillo stages with the Potsdam, Beckmantown and St. 

 Peters stages in the United States and southeastern Canada. Special 

 reference was made, on the one hand, to the Caledonian and American 

 lands and on the other to the Ceratopyge, Phyllograptus and Tetra- 

 graptus faunas of the Areing beds and to the trilobites, Megelapsis lim- 

 hata and M. pJantilimhata of the Landeillo beds. In the Baltic region 

 the Dictyonema fauna thins outward to the east and is superseded by the 

 Ceratopyge forficula forms. The possible routes of migration of marine 

 forms at these stages in our geologic history between Europe and America 

 was explained. 



The Section then adjourned. 



Chestee a. Reeds, 



Secretary. 



SECTION OF BIOLOGY 



10 January, 1916 



Section met at 8 :15 p. m., A'ice-President H. von W. Schulte pre- 

 siding. 



The following program Avas presented: 



Henry Fairfield Osborn, Dinosaurs whicpi Mimic the Ostriches 



AND OTHER StRUTHIOUS BiRDS. 



Roy C. Andrews, The Sei Whale (Balcenoptera horealis). 



Its History, Habits, External Anai- 

 OMY, Osteology and Relationship. 

 (Read by Title.) 



