282 Proceeding!^ of the Royal Society of Victoria. 



Oxyrhina retroflexa, Agassiz. 



Oxyrhina retroflexa, Agassiz, 1843. Poiss, Foss., vol. iii., 

 p. 281, pi. 33, f. 10. 



Oxyrhina crassa, Agassiz, 1843. Poiss. Foss., vol. iii., p. 

 283, pi. 37, fig. 16. 



Oxyrhina vonhaastii, Davis, 1888. Trans. Roy. Dublin Soc, 

 ser. 2, vol. iv., p. 26, pi. 4, figs. 1-3. 



Oxyrhina crassa, Agassiz., A. S. Woodward, 1889. Cat. Foss. 

 Fishes, Brit. Mus. Nat. Hist., pt. i., p. 389. 



Locality and Horizon. — Three miles west of mouth of Gelli- 

 brand River (Geol. Surv. Vic, A.W. 9, Na.t. Mus. Coll.).— Bal- 

 combian. Nine miles west of Casterton (Mines Department 

 3493 Nat. Mus. Coll.). — Barwonian. 



Beaumaris, Port Phillip (Nat. Mus. Coll., purchased from J. 

 F. Bailey, collected by W. Kershaw, presented by C. D. Aplin ; 

 also Pritchard Coll.). Grange Burn (Nat. Mus. Coll., pre- 

 sented by G. Robinson and A. A. Kelley, and piu-chased from 

 R. Lindsay ; also Spry Coll. and Pritchard Coll.). — Kalimnan. 



Observations. — The series before us shows more perfect 

 gradation than those figured by Davis as 0. vonhaastii ; the 

 anterior teeth are fairly well represented by Agassiz's figure of 

 0. erassa, whiltet the short recurved form is undoubtedly his 

 0. retroflexa. The relative abundance and variation in this 

 form affords us a parallel example in dentition with 0. has- 

 talis. 0. retroflexa has been included in the synonym,y of 0. 

 hastalis by A. S. Woodward in his British Museum Catalogue, 

 but, as our series is large and representative, we have been 

 compelled to regard it as a distinct type. 



This species in Europe is recorded from the Eocene, Miocene 

 and Pliocene, and from the Eocene of North America. 



The New Zealand specimens are from the Oamaru formation, 

 Oligocene. 



Oxyrhina eocaena, A. S. Woodwai-d. sp. 



Carcharias (Scoliodon) eocaenus, A. S. Woodward, 1889. Cat. 

 Foss. Fishes, Brit. Mus. Nat. Hist., pt. i., p. 436. 



Oxyrhina eocaena, A. S. Woodward, 1899. Proc. Geol. 

 Assoc, vol. xvi., p. 11, pi. i., figs. 25, 26. 



