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



119 



It maj^ be found that this species, or any of the others named 

 by Agassiz from the Miocene rocks of the Kern region, is identical 

 with some of the multitude of sharks which have been described 

 in Europe from detached teeth. 



Family ECHINORHINIDiE. 

 Genus Echinorhlnus Blainville. 



22. Echinorliinus blakei Agassiz (1. c. p. 272). 



This species "has the main point of the tooth more prominent, 

 and at the same time shorter" than the living EcJimorhinus spi- 

 nosiis, the marginal denticles being smaller. The teeth in Echi- 

 norliinus are very oblique, the point turned outward, with several 

 strong denticles on each side of the tooth. I have not recognized 

 this species. 



Family SCYLLIOEHINIDiE. 

 Genus Chiloscyluium Midler & Henle. 



23. Chiloscyllium species?? 



Three very small teeth, narrow, triangular and nearly erect, 

 with the root very wide, its width nearly twice the height of 

 the tooth, and projecting backward so that the tooth rests on a 

 triangular base double-notched posteriorly. The tooth will stand 

 when set erect on the table. The enamel of the crown extends 

 downward on the root in front to its base. 



These are from the Miocene of Barker Ranch, in Kern County. 



What the genus and species may be is still uncertain. Among 

 recent sharks I find nothing nearer than Chiloscyllium, an East 

 Indian genus. 



Family ABTOBATIDvE. 

 Genus Aetobatis Blainville. 



{Myliobatis Cuvier; Zygobates Agassiz.) 



24. Aetobatis species. 



Professor Agassiz (1 c. p. 275) records the fragment of a 

 tooth of a ray of this genus, from Ocoya Creek. 



We have also numerous fragments from Miocene of Barker 

 Creek, and from Oil City. The teeth are laterally much elong- 



