ZIPHIID^. 327 



I should have preferred Hyperoodontidm for the name of this family, 

 as Hyperoodon is the oldest genus ; but it conveys a false impression, 

 caused by a slip of the pen in describing the teeth in the manuscript 

 (or an error of the press in the work) of Otho Fabricius. 



SrCfOPSIS OF THE G-ENEEA. 



A. Teeth 2 or 4, in front end of the lower jaw, conical. Beak ofskuU with a 

 high a-est on each side, formed hy the elevation of the maxillary bones. 

 Hyperoodontina. 



1. Hyperoodon. Beak of the skull straight; crest of the beak sharp- 



edged above, as high as the occiput. 



2. Lagbnocetus. Beak of the skull ascending ; crest of the beak flat- 



topped, higher than the occipital. 



B. Teeth'ior ^,in froni end of thelmuer jaw, conical or cylindrical. Beak 

 of skvU simple; intermaxillaries enlarged behind, forminy a more or 

 less deep camty round the bloivers. Epiodontina. 



3. Epiodon, Vomer simple, smaller; intermaxillaries elevated, and 



forming a moderately deep, well-marked basin round the blowers. 



4. Pbtbobhynchtjs. Vomer swollen, forming a large, elongated tubercle 



between the callous intermaxillaries ; intermaxillaries forming a deep 

 basin round the blowers. 



C. Teeth in the side of the lower jaw, compressed. Beak of skull simple ; 

 intermaxillaries linear, rather swollen on side of blowers. Ziphiina. 



5. Bbbabditts. Teeth in the front of the side of the lower jaw; lower 



jaw simple, tapering. 



6. ZiPHius. Teeth in the middle of the side of the lower jaw; lower 



jaw simple, tapering. 



7. DioPiiODON. Teeth in the middle of the side of the lower jaw. Lower 



jaw broad behind, suddenly contracted in front. 



A. Teeth 2 or 4:, in the front end of the lower jaw, or often hidden in the 

 gums. Beak of skidl with a high crest on each side above, formed by. 

 the elevation of the maxillary bones. Eyes close to the gape. Cervical 

 vertebrts all anchyhsed. Hyperoodontina. 



Hyperodontina, Oray, Proc. Zool. Soc. 1863. 



Hyperodontina (pars), Ch-ay, Zool. Ereb. Sf Terr. 24 ; Cat. Cetac. B. M. 



1850, ; Froc. Zool. Soc. 1864, 239. 

 Diodonea (pars), Bafin. Anal. Nat. 60, 1815. 

 Les H(5t^rodontes, Duvernoy, Ann. Set. Nat. 1851, xv. 23; Arch. 



Naiurg. 1852, 21. 



