Dr. A. S. ^^'o()lJ\varll on some 



6. Oxyrhina hastalis^ Agassiz. (PI. I. fig3. 6-8.) 



1838-43. O.ri/rhina hastalis, L. Agassiz, op. cit. vol. iii. p. 277, pi. xxxiv. 



figs. 3-13, "lo-lZ. 

 (?) 18o8. Si/ualus eocenm, A. BravarJ, op. cit. p. 51. 

 1881. O.ri/rhuia A(/ass>zii, R. Lawley, Studi Comp. Pesci foss. coi viv. 



peneri Carcharodon, Oxyrhina, e Galeocerdo, p. 93, pis. v.-ix. {Oxy- 



r/dnn). [Tlie species reuamed by Lawley .1 

 1889. Oxyrhina hastalis, A. S. Woodward, Catal. Foss. Fishes B. M. 



pt. i. p. 385. 



Several teeth in the National Museum, Buenos Aires, 

 agree both in size and shape with tlie European Miocene and 

 Pliocene teeth ascribed to this species by Lawley. A well- 

 preserved anterior mandibular tooth is shown from the outer 

 face and in side view in PI. I. figs. 6, 6 a, while two 

 characteristic upper teeth, the first with imperfect base, are 

 seen, outer aspect, in figs. 7, 8. 



7. Carcharodon megalodon^ Agassiz. (PI. I. fig. 9.) 



1835-43. Carcharodon megalodon, L. Agassiz, op. cit. vol. iii. p. 247, 



pi. xxix. 

 1878. Carcharodon yigas, R. A. Philippi, Zeitschr. f. gesammt. Naturw. 



vol. li. p. 685, pi. xix. 

 1881. Carcharodo7i megalodon, R. Lawley, op. cit. p. 35, pis. vi.-xi. 



(Carcharodon). 

 1889. Carcharodon megalodon, A. S.Woodward, Catal. Foss. Fishes 



B. M. pt. i. p. 415. 



There are two upper teeth of this species from Parana in 

 the National Museum, Buenos Aires, one being in the Lelong 

 collection, the other presented by Scnor Don Marcos Sastre, 

 The first is considerably the larger, and is shown of two 

 thirds the natural size in PL ]. fig. 9. It evidently 

 belongs to the middle of the side of the upper jaw, and is 

 quite unabraded. Another upper lateral tooth, from a Tertiary 

 formation at Coquimbo, Chili, has been described by Philippi 

 under the name of C. gigas, and teeth either of the same or 

 a closely related species occur in the Patagonian formation 

 of Chubut. The Chilian specimen was found in a deposit 

 which has yielded teeth indistinguishable from those of the 

 existing Carcharodon Rondeleti (A. S. Woodward, loc. cit. 

 1889, p. 421). 



8. Carcharias [Prionodon) obliquidens (Bravard). 



1858. Sqimlus obliquidens, A. Bravard, op. cit. p. 61. 

 1858. Lamna amplibasidens, A. Bravard, op. cit. p. 53. 

 1858. Lamna serridens, A. Bravnrd, op. ctt. p. 63. 



