Fish -remains from the I'uranu Formation. b 



1896. Carcharias (Aprionodon) Gibhesii, G. de Alessandri, loc. eit. 



p. 721, pi. i. fi^. 3. 

 181*6. Cura.i ad. falcafus, O. de Alessandri, loc. ctt. p. 722, pi. i. fig. 4. 



The meaning of l?ravard'.s .specific names quoted above is 

 indicated l)y his labels in the British Museum and in the 

 National Museum, Buenos Aires. Two teeth in the British 

 Museum marked Lamna ohliquidens are upper lateral teeth 

 of Carchari'is {PriQiiodon) ] numerous specimens in the 

 National ^lu.-^eum ial)elled Lamna se.rridens are obviously 

 upper teeth of the same species, while other specimens labelled 

 Lamna ampUhasidens in both museums are for the most part, 

 if not all, lower teeth of the same fish. The majority of the 

 lower teeth are distinctly serrated, like the specimen erro- 

 neously referred to C. {Aprionodon) Gihhesi by Alessandri; 

 but many of ilie smaller specimens exhibit quite smooth 

 edges — possibly a character of immaturity *. 8ome of tiie 

 upper teeth have been referred to Corax by Alessandri ; but 

 I have made sections of several examples identical in shaps 

 with that represented in his fig. 4, and found all to have 

 a central cavity. I therefore regard his determination of 

 Corax from the Parana formation as a mistake. 



9. Oaleocerdo aduncus, Agassiz. (PI. I. t\<^s. 10, 10 a.) 



1835-4^3. Guleocerdo aduncus, L. Agassiz, op. cit. vol. iii. p. 231, 



pi. x.xvi. tigs. 24-28. 

 1889. Galeocerdu aduncus, A. S. Wooilward, Catal. Fuss. Fishes B. .M. 



pt. i. p. 4-14. 



Like those of Carcharias the species of Galeocerdj are 

 difficult to detertnino, but the tooth from Parana represented 

 in PI. 1. figs. 10, 10 a, seems to belong to the side of the 

 jaw of the European and North-American Miocene species 

 G. aduncus. It is readily distinguished from the Eoceiia 

 G. httidens by its deeper crown and liner serrations. 



10. J lemtpristis serr a, A'f^ixsfi\z. (PI. I. figs. 11, 11 (i.) 



1835-43. IlemipriAtis serra, L. Agassiz, o^a. cit. vol. iii. p. 237, pi. xxvii. 



figs. 18-30. 

 1899. Uemipristis serra, A. S. Woodward, Catal. Foss. Fishes li. .M. 



pt. i. p. 449. 



This species is rare in the Parana formation, but a few 

 well-preserved upper teeth are unmistakable. The best 

 specimen, not in the least abraded, is shown in PI. I. 

 figs. 11, 11 <i. It is in all respects a typical upper tooth. 



* A. Giinther. Catal. Fish«« H. M. vol. viii. (1870) p. 357. 



