488 . proceedings: geological society 



certain distance only, it is not difficult to see the resemblanee between 

 the artificial mine levels and the actual shape of the ore-body as shown 

 on the maps of the 300, 400, and 500-foot mine levels published in 

 U. S. Geological Survey Professional Paper No. 26. 



F. C. ScHRADER gave abstracts of the following papers: Magmatic 

 copper sulphide deposits in Plumas County, Col., by H. W. Turner 

 and A. F. Rogers. Iron ore deposits of Kiruna, Sweden, by R. A. 

 Daly. 



Discussed by La Forge and A, C. Spencer. 



REGULAR PROGRAM 



C. W. Gilmore: Some neiv dinosaurs (illustrated). The speaker 

 discussed briefly some of the more important discoveries of dinosaurian 

 fossils made in North America during the past two or three years, 

 referring especially to the explorations conducted by the American 

 Museum of Natural History and by the Canadian Geological Survey 

 in the Edmonton and Belly River formations in the Province of Alberta, 

 Canada. He stated that the recent finding of several specimens, with 

 which were preserved impressions of considerable parts of the epider- 

 mal covering, leads us to hope that the time is not far distant when 

 the external appearance of these animals will be as well kno\jm as is the 

 internal skeleton. Lantern slides of many of the more striking speci- 

 mens were shown, the speaker confining himself to brief explanatory 

 remarks regarding their systematic position and their more striking 

 characteristics. The following forms were chscussed, Saurolophus, 

 and Corthyosaurus of the trachodont dinosaurs; Ankylosaurus, an 

 armored reptile; Monoclonius, Anchiceratops, Ceratops, Styracosaurus , 

 and Br achy ceratops, all of the Ceratopsia or horned dinosaurs. In 

 conclusion life restorations of Brachy ceratops, Thescelosaurus, and 

 Stegosaurus modeled by the speaker were exhibited for the first time. 



Discussion: Sidney Paige asked by what means it was possible to 

 distinguish in dinosaurs between adult and young individuals. Gil- 

 more said that the principal distinguishing feature was that in the 

 young the sutures of the skull were open, and in the adult they became 

 closed. R. S. Bassler spoke in appreciation of Gilmore's work and 

 referred to the scientific attainments and artistic skill required to make 

 the restorations. 



C. N. Fenner: A geological reconnaissance of Porto Rico (illustrated). 

 The New York Academy of Sciences, with the cooperation of the 

 Insular Government of Porto Rico, has undertaken a natural history 

 survey of the island. A number of expeditions have already been 

 sent out and have made preliminary studies in the botany^ zoology, 

 anthropology, geology, etc. The geological expedition consisted of 

 Prof. Berkey, of Columbia University, and the speaker. They spent 

 four weeks on the island during the past summer. A description was 

 given of the principal geologic and topographic features, most of which 

 were illustrated by lantern slides. (The chief results of the expedition 

 have been published by C. P. Berkev in Annals N. Y. Acad. Sci., 26: 

 1-70. 1915. 



