CETACEA. 61 
_e. Skull with the mazillary bones bent up in front of the 
blowers, and forming a vault. The teeth compressed. 
The paddles fan-shaped, truncated at the end. Plata- 
nistina. 
ye 
‘17. PLATANISTA. 
; _ My thanks are due to Dr. Richardson of Haslar, to Mr. Bright- 
well and the Committee of the Norwich Philosophical Society, 
and to Mr. Bell, for allowmg me to have at the Museum for 
comparison the specimens of these animals im the collections un- 
der their care ; and to Mr. Owen and the Council of the College 
_of Surgeons, and the Council of the Zoological Society, for per- 
“mission to examine the skulls of the different species of this 
family in their Museums. 
a. Jaws tapering, the symphysis of the lower jaw short, not 
% half the length of the jaw. Dorsal fin generally distinct. 
i Pectoral fin ovate acute. Marine. 
_ @. Upper jaw toothless ; lower jaw with only one or two teeth 
F on each side, often hidden in the gums. Beak of skuil 
ir keeled on each side, the keel being sometimes large, and 
forming an elevated reflexed wing on each side. Hyperoo- 
dontina. 
‘Ayperoodontina, Gray, Zool. Ereb. & Terror, 24, 25. 
Diodonea, pars, Rafin. Anal. Nat. 60, 1815. 
if 1. HypERoopon. 
_ Upper jaw toothless; lower jaw with a small, conical, acute, 
‘rudimentary, moveable tooth, m a cavity under the gums, on 
each side of the front part. Blowers lmear, transverse, sub- 
-junate. 
_ Hyperodon, Rajfin. Anal. Nat. 60, 1815. 
‘4% Uranodon, Illiger, Prod. 143, 1811. 
_ Nodus (sp.) edentulus, Wagler, N. S. Amph. 34. 
Orca, Wagler, N.S. Amph. 34. 
2. Hypodon, Haldeman. 
_ Chenocetus, Eschricht, Danish Trans. 
- Cetodiodon, Jacob, Dublin Phil. Journ. 
_ Diodon, Lesson, Ouvr. Buffon, i. 124. 
_ Anarnacus, Lacep.; Dumeril, Z. A.; Rafin. Anal. Nat. 61, 
—_-18)5; Gray, Zool. Ereb. & Terror. 
_ Ancylodon, Illiger, Prod. 142, 1811; Oken, Lehrb. Naturg. 
me 6673, 1815. 
