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. 
De.purnapterus, 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. pl. 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. pl. 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. phoccenoides 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.} - 
Hyreroopon, 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-mular and of senedette, 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 capidolio. It would be one Delphinapterus more, if the 
figure were not ideal; but I fear such is the case, and the more so as this name of 
mular 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. pl. ]xxix. 
+ The muzzle in this figure is too pointed. The White Dolphin with black ex- 
tremities of Commerson must be nearly allied to it. 
+ M. Rafinesque speaks of a Dolphin with two dorsal fins, and MM. Quoy and 
Gaymard saw one they have named D. rhinoceros, Voy. de Freycinet, Li. f. 1; but 
they saw it at a distance, and half merged in the waves, so that there may have been 
some optical illusion. 
§ Hyperoodon, teeth in the palate. 
|| This animal, deseribed 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 T'wo-toothed Dolphin of Hunter; Bausard 
expressly mentions its two teeth. It is also the Bulena 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 of Dale, &c. Chemnitz found one of the 
teeth. See Oss. Foss, tom. V. p. 1. f. 324. 
