80 SPECIMENS OF CETACEA. 



IV. HYPEROODON. (H.) 



Hyperoodon, Lacepkle, Hist. Nat. des Cetacees, 1804. 



Skull with massive maxillary crests in adult male, 

 relatively slender in female and in young male ; 

 premaxillse elevated behind nares and expanded 

 asymmetrically so that anterior surface overhangs 

 nares. Nasal bones between premaxillse concave 

 forward ; mesethmoid imperfectly ossified ; a single 

 tooth near tip of each half of mandible, many un- 

 developed teeth in gum ; sternum composed of three 

 segments ; cervical vertebrae mostly fused together ; 

 caudal fin with posterior border concavo-convex ; 

 blowhole transverse, crescentic. 



(1) Hyperoodon rostratus. (H. r.) 



(Bottlenose Whale.) 

 Balsena rostrata, 0. H. Midler, Zool. Dan. Prod., 1776. 

 Hyperoodon butskopf, Lacepede, supra cit. 

 Hyperoodon bidens, Fleming, British Animals, 1828. 



Colour black or greyish black on back and sides, 

 yellowish grey on ventral surface ; pair of lateral 

 furrows on under part of throat ; head with boss- 

 like frontal protuberance, below which an attenuated 

 beak constitutes " the neck of the bottle " ; dorsal 

 fin high behind the middle of the back ; pectoral fin 

 relatively small ; length from 20 to 30 feet. 



