Vol. 5] Jordan. — The Fossil Fishes of California. 



135 



half inches in diameter and two and one-half inches in length. 

 The vertebra? decrease only slightly in length backward. There 

 were probably as many as forty in all. 



RECAPITULATION. 



By the geological horizons, these species may be classified as 



follows : 



QUATEENAEY. 



Carcharodon riversi Jordan. 



Carcharodon arnoldi Jordan. 



Acipenser medirostris Agassizt 



Mylopharodon conocephalus (Baird and Girard). 



Ptychochelius grandis (Ayres). 



Urolophus halleri Cooper? 



PLIOCENE. 



Dalatias occidentalis (Agassiz). 

 Galeus (syopterus Jordan and Gilbert) ? 

 Carcharodon riversi Jordan. 

 Isurus tumulus (Agassiz). 



MIOCENE. 



Meptranclvias andersoni Jordan. 

 (Echinorhinus blalcei Agassiz.) 

 Dalatias occidentalis Agassiz. 

 Galeocerdo productus Agassiz. 

 Carcharias antiquus (Agassiz). 

 Careliarias sp. 



Hemipristis heteropleurus Agassiz. 

 Lamna clavata Agassiz. 

 (Lamna ornata Agassiz.) 

 Isurus planus (Agassiz). 

 Isurus smithii Jordan. 

 Isurus tumulus (Agassiz). 

 Carcharodon arnoldi Jordan. 

 Carcharodon branneri Jordan. 

 (Carcharodon rectus Agassiz.) 

 Chiloscyllium species? 

 Aetobatis species. 

 Etringus scintillans Jordan. 

 Etringus species? 

 Clupeoid fish A. 

 Clupeoid fish B. 

 Clupeoid fish C. 

 Pterothrissoid fish. 

 Sogenio solitudinis Jordan. 



