CETACEA. 7,3 



3. DELPHINORHYNCHUS. 



Head attenuated, contracted behind. Nose produced, bald, 

 not separated from the forehead. Eyes moderate. Lower jaw 

 fitting into a groove in the edge of the upper. Teeth few, small 

 or rudimentary, in middle of lower jaw, not developed till late. 

 Throat with four parallel slits beneath. Body elongate, rather 

 swollen behind. Pectoral fin low down the side, oval, narrow, 

 small. Dorsal falcate, behind the middle of the body, about f 

 from the nose. Blowers on the crown, in a curved line, with the 

 concavity in front. Tail with two falcate lobes, flat, without any 

 central prominence. Sexual organs under middle of dorsal. 



Skull triangular. Forehead very high in front and swollen 

 behind. Intermaxillaries curved in front. Nose very long, com- 

 pressed at the hinder end, very narrow, slightly keeled on each side. 

 Hinder wing of the maxilla expanded horizontally over the orbits. 

 Nasal bones encased in the frontal and intermaxillaries. Tem- 

 poral pit very small. Palate smooth. Lower jaw-bones elongate, 

 tapering, slender, nearly straight. The ear-bone is attached by 

 an apophysis to the base of the skull. " Vertebrae 38; viz. 

 6 cervical separate, 10 costal, 11 lumbar, 11 true caudal. Meta- 

 carpal bones cartilaginous." Dumortier, Mem. Brux. xiii. t. 10. 



Nodus, sp. Wagler, N. S. Amph. 34, 1830. 



Delphinorhynchus, Blainv. Rapp, Cetac.j Gray, Zool. Ereb. fy 



Terror. 



Delphinorhynchus, sp. F. Cuvier. Cetac. 114. 

 Aodon, Lesson, (Euv. Buff on. 

 Heterodon, sp. Blainville ; Lesson, Man. 

 Delphinus, sp. Blainville ; Desm. Mam. 



The skull (as remarked by M. Cuvier) much more resembles 

 that of Delphinus than Hyperoodon. The animal is at once known 

 from the latter genus by the head not being convex and rounded 

 in front, and by the teeth being in the middle and not at the end 

 of the jaws, and from Ziphius by the small size of the teeth. 



Blainville, when he first saw the animal on the coast of France, 

 considered it the same as Dale's Hyperoodon, and F. Cuvier fol- 

 lows him ; but M. Cuvier pointed out, in the Regne Animal, the 

 difference in the form of the skull of the French animal. 



DELPHINORHYNCHUS MICROPTERUS. BLAINVILLE'S WHALE. 



Body deep ash, beneath white (when alive brownish ash-colour, 

 belly whitish ash) ; forehead tapering ; dorsal fin f , pectoral fin f , 

 from end of nose ; blowers before the eyes. 



Dauphin de Dale, Blainv. N. Bull. Soc. Phil. 1815, 329 ; F. Cuv. 

 Mam. Lith. t. bad. 



D 



