836 



SCIENCE. 



[X. S. Vol. XVIII. Xo. 4G9. 



tawa, Chicago, Washington and Pittsburg 

 museums have been repeatedly visited. Mr. 

 W. K. Gregory was sent to the British 

 Museum of Natural History, London, for a 

 special study of the titanothere material there, 

 and -work has also been done through the 

 aid of Dr. Max Schlosser, in Munich. The 

 chief results obtained thus far are: (1) The 

 systematic revision of the entire group of 

 titanotheres ; (2) the separation of the con- 

 temporaneous phyla above referred to, illus- 

 trating the law of local adaptive radiation, 

 and the polyphyletic division of the peris- 

 soda ctyls; (3) the establishment of the law of 

 correlation- of skull with skeletal structure; 

 (4) the independent development of the horns 

 in three separate Eocene phyla, illustrating 

 the law of predeterminate evolution. New 

 methods of illustration in photography have 

 been developed especially for this volume, un- 

 der the direction of Mr. A. E. Anderson. 



A special geological expedition to the Eort 

 Bridger Beds, under the direction of Dr. W. 

 D. Matthew, assisted by Mr. Walter Granger, 

 during the summer of 1902, laid the founda- 

 tion for more exact stratigraphic data con- 

 cerning the distribution of species, both of 

 the titanotheres and of other mam m als. This 

 preliminary survey in a measiire tends to re- 

 place the lake theory of deposition in the 

 Bridger beds by the flood plain theory already 

 advocated by Professor W. M. Davis. If con- 

 firmed, it will give a further blow to the long- 

 prevailing ' lake basin theory,' which, during 

 the previous season, was unsettled in the Oli- 

 gocene beds by the observations of Mr. J. B. 

 Hatcher and Professor Eberhard Eraas, in 

 connection also with this titanothere mono- 

 graph. A party from the American Museum, 

 under the direction of Mr. Walter Granger, 

 is now continuing the observations begun last 

 season on the Bridger strati^'raphy, and when 

 these results are in, Dr. Matthew will be able 

 to present his report. 



2. Ceratopsia Monograph. — The assig-nment 

 of this monograph to Mr. J. B. Hatcher is 

 particularly appropriate, because of the fact 

 that he practically discovered these animals 

 while working for Professor O. C. Marsh un- 

 der the U. S. Geological Survey; and that the 



entire collections in the National Museum 

 and the Yale University Museum are due to 

 him. Mr. Hatcher has completed the bib- 

 liographical and reference section, as well as 

 tlie preliminary revision of the iJrincipal forms 

 of the Ceratopsia, and has reached very in- 

 teresting and novel results. By the terms of 

 his agreement with the Survey, materials in 

 the Yale University Museum, through the co- 

 operation of Professor C. E. Beecher, have 

 been further prepared for description; also, 

 materials in the U. S. National Museum and 

 in the American Museum of Natural History. 



The necessity of more exact stratigraphic 

 work than that already contained in the pre- 

 vious studies by Cope, Hatcher and others of 

 the vertebrate paleontology of the Cretaceous 

 became apparent in 1902 partly through the 

 studies by Professor Osborn and Mr. Lawrence 

 M. Lambe, under the Canadian Geological 

 Survey, on the fauna of the Belly Eiver region 

 in the Northwest Territory.* 



From these it appeared that the union of the 

 Judith River and the Laramie by Cope and 

 Marsh was partly, at least, erroneous, that two 

 distinct vertebrate faunse were represented, 

 that part of this fauna in Montana, as well as 

 in the Northwest Territory, was older than the 

 Fort Pierre beds. The subject caused wide- 

 spread interest and discussion. Never was the 

 necessity of the union of accurate paleontol- 

 ogical and stratigraphic work more apparent. 

 Accordingly in June, 1903, Messrs. T. W. 

 Stanton and J. B. Hatcher were detailed by 

 the survey for a complete reconnoissance, ex- 

 tending from the Belly Eiver beds in the 

 north across the boundary down into the 

 Judith River country, to terminate with the 

 Converse Co., Wyoming, beds west of the 

 Black Hills. Mr. Hatcher has reported by 

 letter and in Science the complete success of 

 this trip. The general conclusion is reached 

 that the Judith River and Belly Eiver are 

 fresh-water deposits overlain by a portion of 

 the Fort Pierre and distinctly older than the 

 Laramie. 



* ' On Vertebrata of the Mid-Cretaceous of the 

 Northwest Territory,' Geol. Surv. Canada, ' Con- 

 tributions to Canadian Paleontology,' Vol. III. 

 (quarto), Part IL, Ottawa, 1902. 



