92 



Asterospondyli, 



Wall-case, ^he Scylliidaa range from the later Jurassic upwards. 



[ No. 3, and They are represented in the Bavarian Lithographic Stone by 



Table-case, Palceoscyllium, in the Upper Chalk of Mount Lebanon by 



Wall-case, 

 No. 3, and 

 Table-cases, 

 Ncs 26 and 

 27. 



25. Teeth of Cochliodus <:ontorti>,*, Ag. ; Carboniferous Limestone, Armagh. 



Mesiteia, and in the English Chalk by Cantioscyllium. Teeth 

 of the existing Ginglymostoma are exhibited from the Eocene. 



The Lamnidse and Carchariidse are the characteristic sharks 

 of modern times, but are very rarely found fossil except in the 

 form of detached teeth, vertebras, and portions of calcined carti- 

 lage. To the Lamnidaa may be assigned the fine examples of 

 Scapanorhynchus from the Upper Cretaceous of Mount Lebanon, 

 which exhibit a dentition identical with that of Odontaspis, but 

 differ in the remarkable elongation of the snout and in the 

 arrangement of the fins. To the Carchariidae belong several 

 fine fishes from the Upper Eocene of Monte Bolca, near Verona, 

 of which there are no specimens in the Collection. A large 

 series of detached teeth is exhibited, but it is impossible to name 

 and arrange them satisfactorily, owing to the variation of shape 

 always occurring in one and the same mouth. Lamna (including 

 Otodus, in part) and Oxyrhina seem to range from the Cretaceous, 



FIG. 126. 



FIG. 127. 



FIG. 126. Tooth of Odontaspis etegans, 

 Agassiz ; London Clay. 



FJG. 127. Tooth of Carcharodon megalodon, 

 Agassiz ; Suffolk Crag. (One-third nat. size.) 



while Corax is the tooth of an extinct member of the LamnidaB 

 of the same age. Odontaspis (Fig. 126) is Tertiary and Recent. 

 The Jurassic Orthacodiis may even belong to this family. The 

 teeth of Carcharodon, however, are the most interesting of such 



