154 CATALOG OF POSSIL FISHES IN THE MUSEUM 



interest, as it proves beyond doubt that Orodus occurred in the De- 

 vonic; and that sharks with a grinding dentition suitable for feeding 

 on hard food existed contemporaneously with the predaceous clado- 

 dont-toothed sharks, — Cladoselache, Cladodus and Ctenacanthus. 



Orodus devonicus is distinguished from other American species by 

 its low, obtuse denticles, by their style of ornamentation, and by the 

 general proportions and symmetry of the tooth. 



Family HETERODONTID^ 

 [Port Jackson Sharks] 



Hybodus reticulatus Ag-assiz 



E 2495 A large fin-spine, 29.5 cm. in length; maximum width, 3 

 mm. Liassic; Lyme Regis, England. 



Family LAMNID^ 

 [Porbeagle, Mackerel and Great White Sharks] 



Lamna gracilis Agassiz 

 E 2141 Three teeth. Eocene; S. Carolina. 



Odantaspis cuspidata (Agassiz) 

 E 2142 Two teeth. Eocene; S. Carolina. 



Isurus desorii (Agassiz) 

 E 2137 Three teeth. Eocene; S. CaroHna. 

 E 2138 One tooth. Eocene; Florida. Ottomar Reinecke. 



Isurus hastalis (Agassiz) 

 E 2134 Eight teeth. Eocene; Sienna, Italy. 

 E 2135 Two teeth. Eocene; S. CaroHna. 

 E 2136 One tooth. Eocene; Florida, Ottomar Reinecke. 



Carcharodon auriculatus (Blainville) 



E 2133 Six teeth. Eocene; Ashley River, S. Carolina. Presented 

 by Roswell H. Johnson. 



