CETACEA. 187 



by the old males, and is sometimes thrown upon the coasts of 

 Europe. It has from nine to thirteen teeth throughout, but loses 

 them all with age. 



Delphinapterus, Lacep. 

 Only differs from the Porpoises in having no dorsal fin. 



D. leucas, Gm. ; D. albicans, Fabr. ; Huid fisk of the Danes ; 

 Scoresby, Arct. Reg. II. pi. xiv. (The Beluga, or White Grampus). 

 Nine teeth throughout, thick and blunt at the end; skin of a 

 yellowish white ; head, externally convex, like that of a Porpoise ; as 

 large as the Grampus. Found in the Frozen Ocean, whence it often 

 ascends rivers to some distance.* 



D. leucoramphus, Peron. ; Voy. de la Coq. pi. ix.f Inhabits the 

 South seas ; the head is convex and pointed ; the muzzle, a part of 

 the pectoral fins, and the whole under part of the body of a beautiful 

 white. The back is blue, and it has from thirty-eight to forty-two 

 teeth throughout. The 



D. phocoenoides is a species of this subgenus, discovered by M. 

 Dussumier at the Cape ; it has the round head, and the compressed 

 and obtuse teeth of the Porpoise. J 



Hyperoodon, Lacep.^ 



The Hyperoodons have the body and muzzle very similar externally to 

 those of the Dolphin properly so called ; but the cranium is elevated at 

 its edges by vertical bony partitions ; they are generally found to have but 

 two small teeth in front of the lower jaw, which do not always appear ex- 

 ternally ; their palate is studded with small tubercles. 



One species only is known, which attains a length of from twenty 

 to twenty-five feet, and perhaps more. It is taken in the British 

 Channel and the North Sea, and is often called the Baleine a 

 bec.\\ 



* Rondelet, under the name of peis-rmtlar and of senedeile, represents a Cetaceous 

 animal very similar to the Beluga; but he does not say it is white. He also applies 

 to it the Italian name of capidoUo. It would be one Delphinapterus more, if the 

 figure were not ideal; but ] fear such is the case, and the more so as this name of 

 jtnilar and that of capidolio belong properly to the Cachalot. Besides this, the Beluga 

 has occasioned the formation of a little white Cachalot, from the circumstance of so 

 soon losing its upper teeth. See its head, Voy. de Pallas, Atl. pi. Ixxix. 



f The muzzle in this figure is too pointed. The White Dolphin with black ex- 

 tremities of Commerson must be nearly allied to it. 



X M. Rafinesque speaks of a Dolphin with two dorsal fins, and MM. Quoy and 

 Gaymard saw one they have named Z). r7«'«oceros, Voy. de Freycinet, II. f. 1; but 

 they saw it at a distance, and half merged in the waves, so that tliere may have been 

 some optical illusion. 



§ Hyperoodon, teeth in the palate. 



II This animal, described by Baussard, Jour, de Phys. March 1789. ( Delph. eden- 

 tulus, Schr.) to which Bonnaterre has transferred the name of buts-kopf, which be- 

 longs to the Grampus, is the same as the Two-toothed Dolphin of Hunter; Bausard 

 expressly mentions its two teeth. It is also the Balcena rostrata of Klein and of 

 Chemnitz, Besch. der Berl. ges. IV. p. 183; of Pennant, Brit. Zool. No. V; of Pon- 

 toppidan, Nor. II. 120; the Bottle- head oi Dale, &c. Chemnitz found one of tlu' 

 teeth. See Oss. Foss. toni. V. p. 1. f. 324. 



