1396.] Geology and Paleontology. 135 



points to a still higher differentiation 90 characteristic of the later 

 genera of the Equine series. The characters above enumerated as dis- 

 tinguishing the molars of Pachynolophus from those of Hyracotherium, 

 I think should be considered as generic. At least they are the only 

 valid ones which I can discover at present. 



Species of Perissodactyle Ungulatus allied to Hyracotherium occur 

 in the Wasatch of America, which have been referred to Pachynolo- 

 phus. In these forms the last inferior premolar is truly molariform, 



crowns and nearly bunodont external cusps. As this a combination of 

 characters, which as far as known does not occur in the true Pachyno- 

 lophus of Europe, I think accordingly that these species should be 

 placed in a different genus from Pachynolophus. Prof. E. I). Cope has 

 shown that the generic name Orotherium Marsh, has been anticipated 

 by Orotherium Aymard, consequently I believe that the name Orohippus 

 should be reinstated, and applied to those species of Hyracotherium 

 which have the last lower premolar truly molariform in structure. I 

 have already stated that in the type specimen of Hyracotherium 

 (^Pliolophus) vulpiceps the last lower premolar is simpler in structure 

 than in any of the true molars. Accordingly those species with the 

 complex lower premolar represent a true generic stage, and as is already 

 shown they differ from the true Pachynolophus. — Charles Earle, 

 Laboratoire de Palazontologie Jardin des Plantes, Paris, Dec. 20, 1895. 



The Glossopteris Flora in Argentina.— A collection of fossil 

 plants from Bajo de Velis, a league from the entrance to the Cantana 

 valley in Argentina, has enabled Dr. F. Kurtz to establish the age of 

 the fossiliferous shales of that region. The author gives tabulated com- 

 parisons of the flora of the Bajo de Velis beds with similar floras found 

 at the Cape of Good Hope (Ekka-Kimberly beds), in peninsular India 

 (Kaharbari beds), in New South Wales (Newcastle beds) and in Tas- 

 mania (Mersey Coalfield). From these tables it is seen than the spec- 

 imens found at Bajo de Velis are most nearly related to those of the 

 lower Gondwanas of India. Dr. Kurtz accordingly corrrelates the 

 fossiliferous shales of Bajo de Velis with the lower Gondwanas of India, 

 and agrees with the paleophytologist, O. Feistmantel, in assigning these 

 beds to the Permian age. 



Up to date but three rock formations in Argentina have yielded fossil 

 plants: Retaraito in San Juan, which has been shown by Dr. Szajno- 

 cha to be Lower Carboniferous ; Bajo de Velis which is Permian ; and 



