398 Analytical Synopsis of the Order of Squall. 



Dorsal close behind pectorals. Isurus. 



Teeth compressed, triangular, entire, with one or two 

 short pointed denticles on each side of the older 

 ones. Lamna. 



Subfamily CETORHININJ^ Gill. 



Genus Cetorhinus Blainville^ 181G. 

 Tetroras Bafinesque 1810 (description and name improper). 

 Selache Cuvier, 1817. 



Type Squalns maximus Linn. 



Genus Polyprosopus Couch, 1861.* 

 Type Polyprosopus RasUleiglianus Couch. 



Subfliraily LAMNIN^ Gill. 

 Genus Carcharodon A. Smith. 

 Type Squaliis careharias Linn. 



Genus IsuROPSis Gill. 

 Type Oxyrhina glaucus Mull, and Ilenle. 



Genus Isurus Rafinesque, 1810. 

 Oxyrliina Agassis. 



Type Isurus oxyrhynclius Baf. 



Genus Lamna Cuvier, 1817. 

 Lamia Risso. 

 Isurus Gray^ 1815. 



Type Lamna cornubica Cuvier. 



Family ODONTASPIDOIDJE {Miill. and Henle) Gill. 

 Genus Odontaspis Agassiz. 

 Careharias Bafinesque 1810 (misconception). 

 Triglocliis Muller and Ilenle.^ 1838. 

 Type Careharias taurus Baf. 



* This genus seems to be vahd, but is not yet well established. The absence of 

 caudal carince or spiracles is quite improbable. 



