152 Lucas- — On Carcharodon AFortoni Gihhes. 



Among the specimens of Carcharodon in the United States 

 National Museum is a very perfect and beautiful t<joth, collected 

 b}^ Ira Saylcs in the vicinity of Richmond, Ya., which agrees 

 very well with Gil)bes' description and figure of C. rnorUmi. Al- 

 though very thick and massive, the specimen presents a curi- 

 ousl}^ distorted and Itulged appearance, precisely as if it had 

 been spread out l)y pressure on the apex of the tooth. On the 

 anterior face are evidences of injury, and from this has undoubt- 

 edly resulted the unusual sha})e of the tooth. The specimen 

 figured l)y Giljbes has the same unnatural, swollen look as the 

 tooth in the United States National Museum, and there can be 

 no doubt but that it too is a mere abnormality, possibly caused 

 by a similar accident to the tooth while young. 



The extreme rarity of examples of Carcharodon morton! is in 

 accord with the supposition that they are merely abnormal 

 teeth, and as lateral cusps are lacking in the few specimens 

 recorded, Carrharodon /^or//);;/ Gibbes, should stand as a syno- 

 nym of Carcharodon inc<j<d<>don Agassiz. 



