CETACEA: 209 
Detpninarrerus, 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. H, pl. xiv. (The Beluga.) Nine teeth 
throughout, thick and blunt at the end; skin of a yellowish 
white; head, externally convex, like that of a Porpoise; as large 
asthe Grampus. Found in the Frozen Ocean, whence it often 
ascends rivers to some distance.(1) 
D. leucoramphus, Peron.; Voy. de la Coq. pl. ix.(2) 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. phocenoides 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.(3) 
HyprErroopon, Lacep.(4) 
The body and muzzle very similar externally to those of the Dolphin 
properly so called; but the cranium is elevated at itsedges 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 externally; 
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 @ bec.(5) 
(1) Rondelet, under the name of peis-mular and of senedette, represents a Ceta- 
* ceous 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. Be- 
sides 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. Ixxix. 
(2) The muzzle in this figure is too pointed. The White Dolphin with black 
extremities of Commerson must be nearly allied to it. 
(3) 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, I, f. 1; 
but they saw it at a distance, and half merged in the waves, so that there may 
' have been some optical illusion. 
(4) Hyperoodon, teeth in the palate. ie 
(5) This animal, described by Baussard, Jour., de Phys. March 1789, (Delph. 
edentulus, Schr.) to which Bonnaterre has transferred the name of buts-kopf, which 
Vou. I.—2 B 
