10 PROCEEDINGS OF THE ACADEMY OF 



such fragments as to forbid final determination, though the name 

 given is probably correct. The Dinosaurian remains are most 

 abundant, including fragments of many parts of the skeletons of 

 several species. The Cionodon stenopsis is of about the size of the 

 C. arctatus, Cope, but has a much diminished palatine face of the 

 maxillary bone, and the teeth do not present the longitudinal keel 

 on the lower part of the crown seen in the more southern saurian. 



The species represent a portion of the fauna of the Fort Union 

 Epoch, as observed in Dakota and Colorado, and the presence of 

 Dinosauria demonstrates again its pertinence to the cretaceous 

 period. The genus of tortoises Compsemys, Leidy, is peculiar to 

 the Fort Union Epoch, while Plastomenus, Cope, belongs to the 

 Eocene. Its presence in this fauna would constitute an import- 

 ant assimilation to the lower tertiary, but the specimens are not 

 complete in some points necessary to a final reference. The 

 species are in any case nearly allied to that genus. 



There are, however, gar scales included in the collection, which 

 closely resemble those of the genus Clastes of the lower Eocenes 

 of the Rocky Mountains. This is empirically another indication 

 of near connection with tertiary time, but not conclusive, since 

 allied genera have a much earlier origin in mesozoic time. For 

 the present their occurrence in this fauna cannot be regarded as 

 of much weight in comparison with the presence of numerous 

 Dinosauria, an order which in every other known portion of* the 

 earth perished with the age of ammonites and pterodactyles. 

 Nevertheless the list of species, short as it is, indicates the future 

 discovery of a complete transition from cretaceous to eocene life 

 more clearly than any collection }*et obtained marking this horizon 

 in the West. 



Miner alogical Notes. Prof. Persifor Frazer, Jr., explained that 

 in his communication of Dec. 22, 1874, for Diorite he meant Sya- 

 nite. Prof. Frazer also spoke of some observations recently made 

 by him on a specimen of Chlorite slate in which were found crys- 

 tals of Oligoclase which were again found upon examination to 

 contain other crystals of Chlorite slate. 



January 12. 



The President, Dr. Ruschenberger, in the chair. 

 Seventeen members present. 



The Herpefology of Florida Prof. Cope made some remarks 

 on the Batrachians and Reptiles of Florida. He stated that it 

 formed a distinct subdivision of the Austroriparian region (see 

 Gray's Atlas of the United States, 1873, for a review of the Geo- 



