124 ANALES DE LA SOCIEDAD CIENTÍFICA ARGENTINA 



ihen but just returned to Santa-Cruz, he had never found any 

 mammalian remains whatsoever associated with the remains of 

 Dinosaurs. On his last trip however he said he had found a few 

 SQialI multituberculate teelh associated with Dinosaurian remains 

 in the Guaranitic beds on ihe upper course of the Rio Shehuen. 

 Theseare señor Carlos Ameghino's stateinents to me concerning the 

 stratigraphic relations of these Dinosaurian and Mammalian fau- 

 nas. It v/i\\ be noticed Ihat they agree on the whole with the pu- 

 blished statements of Drs. Santiago Roth and AlcidesMercerat. They 

 also explain why I have been unable to find the Pyrotherium 

 fauna associated with the Dinosaurs. Such mistakes based on 

 misunderstandings are always liable to occur, and are excusable 

 where, as was the case in ihis instance, the author was recording 

 not his own observations but the impressions leít upon him by the 

 narralion of the observations of another, made in a región with 

 wich he was himself not only unfamiliar but entirely unacquain- 

 ted. (Hatcher, 2, pag. 94)». 



Je repousse cette forme de discussion que, et j'en demande par- 

 don á M. Hatcher, ne me parait pas trop corréete; il a supris la 

 bonne íoi de mon frére en lui raccontant que j'ai dit, ce qu'en vé- 

 rité je n'ai jamáis dit. C'est toul clair : il a demandé á Charles s'il 

 avait trouvé desdébris de mammiféres associés á ceux de Dinosau- 

 riens, etil lui répondit, non. Si en place de cela, il lui aurait de- 

 mandé s'il avait trouvé des débris de mammiféres dans la méme 

 formation qui contient des os de Dinosauriens, certainement il lui 

 aurait répondu, oui. Pourrait-il M. Hatcher m'indiquer, oü, dans 

 quel ouvrage, et á quelle page j'ai dit que C. Ameghino a trouvé des 

 os de mammiféres associés á des os de Dinosauriens? Nulle part! 

 La traduction de l'article dont parle M. Hatcher est parfaitement 

 corréete (1), mais la traduction que lui enadonné á mon frére, qui 

 ne lit pas Tangíais, est compléteraent inexacto. Dans l'article dont 

 lui fait mention, tout ce qu'á ce sujet je dis, c'est : « That this for- 

 mation is secondary, is clearly indicated by the Dinosaurs ; on the 

 other haqd, as its upper beds pass insensibly into another forma- 

 tion, wich contains numerous remains of mammals, it cannot be 



(1) 17, Ameghino, F., Notes on the Geology and Palaeontology o f Argentina. 

 Translated, with Supplementary Observations, by Arthür Smith Woodward, in 

 Geological Magazine, Décade IV, vol. IV, numero 391, pages 4 á 23. Janvier 

 1897. 



