102 Dr. H. Burmeister on some Cetaceans. 
O. gladiator. | O. capensis. |O. magellanica. 
Length, entire .-...ss..c0e0 33 363 
Length of nose ...--+--sse0ee 195 18 
Length of teeth-line......... 143 14 
Length of lower jaw......... 273 29 
Breadth at notch .........00. 103 12 
Breadth at orbits ............ 18 21 
Breadth of temple...........- 18 20 
Breadth at middle of beak 3 10 
Breadth of intermaxillaries ae 3 
Breadth in front .........+++ 4 3 
Breadth in middle ......... 33 4 
These measurements show that the beak is longer than in the 
Cape species, and relatively shorter than in the European spe- 
cies, but perhaps of the same breadth; the teeth-line is longer 
than in either of them, and the after part, between the orbits 
and temples, rather smaller and not so broad. Other differences 
are presented by the forms of the different bones. 
The intermaxillaries, which in Orca gladiator are narrowed to 
the apex, and in O. capensis are enlarged into an ovate figure 
(as shown by the drawings in the Voy. Ereb. and Terr. pls. 8 & 9), 
have a more rounded form in O. magellanica, and are broadest 
at the apex; from that point they go in a straight line to the 
base of the nose, only becoming rapidly narrower near the notch, 
where the breadth is only 34 inches (at the anterior extremity 43), 
and then are extended into the usual elliptical part surrounding 
the nasal apertures. In consequence of this breadth of the in- 
termaxillaries in the anterior region, the maxillaries are slender, 
and narrower than in the other two species. 
In the form of the occiput Orca magellanica agrees rather 
with O. capensis than with O. gladiator, being larger and having 
a somewhat excavated surface, and a sharp crest on the whole 
circumference above. This crest has in the middle a posteriorly 
protracted angle, into which enters the high protuberance of the 
frontal bones behind the nasal apertures ; from the edge of this 
angle a sharp elevated margin or line descends along the middle 
of the occiput to the great occipital foramen. The sides of the 
occiput are sloped more backward, as in O. capensis, and thus 
form a larger posterior temporal cavity. The tuberosity before 
and above the. orbits seems to be not so high; but the lower 
angle of this tuberosity in front of the entrance into the orbit is 
much sharper and more descendant, and the small notch in the 
middle of the upper margin of the orbit is somewhat broader ; 
but the form of the entrance of the orbit is exactly the same as 
in Orca capensis. The postorbital process also shows some dif- 
