76 DR. J. E. GRAY ON THE GENUS ORCA. [Jan. 27, 
width in the whole of their length ; in the Seychelles skull they are 
contracted in the greater part of their length, and rather dilated in 
front. 
3. ORCA LATIROSTRIS. 
Delphinus orca, Cuv. Oss. Foss. v. tab. 22. fig. 4 (skull). 
The skull very similar to that of the Gane. species, but much 
smaller; but the beak is rather narrower, the intermaxillaries mo- 
derately broad, slightly dilated in front. 
Hab. North Sea. 
An adult skull from the coast of Essex (361 a), and another with- 
out the lower jaw, are in the British Museum. 
These skulls of the smaller British or, rather, European Orca are 
distinguishable from those of O. gladiator by the smaller size and 
the broader, rounder nose—and from the skulls of the Cape-of-Good- 
Hope species by being of a much smaller size, and having a depressed 
crown of the head. 
I believe the skull figured under the name of Delphinus orca by 
Cuvier, Oss. Foss. vol. v. tab. 22. figs. 3, 4, represents this species, 
from the form of the beak and the narrowness of the occiput: this 
figure has been copied by various British and other authors. 
” Gervais, i in the ‘ Zoology and Paleontology of France,’ figures the 
skull of a young De/phinus orca, taken on the coast of Cette, which 
is now in the Museum of Paris. It appears to belong to this spe- 
cies, or it may be that the Orca of the Mediterranean does not grow 
to the usual size; or, again, it may be of a different species, for the 
skull is only fifty-eight centimetres long and thirty broad. 
4. ORCA MAGELLANICA. 
Orca magellanica, Burmeister, Ann. & Mag. Nat. Hist. ser. 3. 
vol. xviii. p. 101; An, Mus. Publ. de Buenos Ayres, vol. i. p. 373, 
tab. 22. 
Hab. Patagonia (Mus. Buenos Ayres). 
This species, according to the figure, is very like Orca latirostris. 
Il. The beak from the notch before the orbit the same length as from 
the notch to the condyle ; width at the notch two-thirds the en- 
tire length of the beak. Intermawillaries very narrow, slightly 
dilated in front ; brain-cavity broad ; occiput deeply concave. 
Lower jaw very broad on the sides, very thick and solid in front. 
Opuysta, Gray, Synopsis of Whales and Dolphins, p. 8. 
5. ORCA PACIFICA. 
Delphinus globiceps, Grant, P. Z.S. 1833, p. 65. 
Delphinus orca, Kydoux, Mus. Paris. 
Orca capensis, Gray, Zool. Erebus and Terror, p. 34, tab. 9, not 
Cat. Seals and Whales, p. 283. 
Orca (Ophysia) capensis, Gray, Synopsis of Whales and Dolphins, 
p. 8, tab. 9 (skull). 
Hab. North Pacific (Capt. Delville, R.N.). 
Skull, from the Zoological Society’s collection. 
