204 DR. GIBBES' MONOGRAPH OF THE 



FAMILY SQUALIDtE. 



TEETH WITH CRENATED EDGES. 



GENERA. 



Glyphis, Agassiz. 



Carcharodon, Smith. 



Carcharias, Cuvier. 



Carcharopsis, Agassiz. 



Sphyrna, Rafinesque. Zyg^ena, Cuvier. 



Galeocerdo, Muller and Henle. 



Hemipristis, Agassiz. 



Notidanus, Cuvier. 



Aellopos, Agassiz. 



TEETH WITH SMOOTH EDGES. 

 GENERA. 

 Lamna, Cuvier. 

 Otodus, Agassiz. 

 OxYRHiNA, Agassiz. 

 ScYLLionus, Agassiz. 

 Thyellina, Munster. 

 Arthropterus, Agassiz. 



GENERA AND SPECIES DESCRIBED. 



CRENATE TEETH. 

 Genus CARCHARODON, Smith. 



Sp. 1. C. MEGALODON, Agass. PI. xviii. figs. 1 to 9. 

 Var. RECTiDENS, Agass. PI. xviii. fig. 4. 

 " suBAURicuLATUs, Agass. PI. xviii. figs. 5 and 6. 

 2. C. ANGUSTiDENS, Agass. PI. xix. and xx. fig. 10 to 38. 

 Var. i.ANCEOLATUS, Agass. PI. xx. figs. 19 to 23. 

 HETERODON, AgaSS. PI. XX. figs. 30, 31, 32. 

 MEGALOTIS, Agass. PI. XX. figs. 24 to 29. 

 AURicuLATUs, Agass. PI. xix. fig. 12. 

 TURGiDUS, Agass. PI. xix. figs. 13 to 16. 

 SEMisERRATUs, Agass. PI. XX. figs. 33 to 36. 

 TOLiAPicus, Agass. PI. xix. figs. 17, 18. 



