100 Dr. H. Burmeister on some Cetaceans. 
position of the teeth—2nd, 3rd, 4th, and 5th molars). The 
skull is not very flat, and has no crest; the upper surface is 
rounded and the orbits very large, with a sharp spine on the 
anterior, and a horizontal crest on the upper margin. Teeth $I. 
and °° M.; the two outer incisors in the upper jaw are much 
more prominent and of a conical form, like the canines; but 
the other four are smaller than those in the lower jaw; the 
upper with two points, one before, the other behind, of equal 
size; the lower with a transverse obtuse margin, somewhat 
higher than the outer edge. The canines have not attained 
their full size. Of the six upper molars, the first four descend 
perpendicularly, the other two are sloping, with the apex back- 
wards; each of them has a large conical crown, with a small 
acute tubercle on the anterior margin of the base, and the three 
last have another more elevated tubercle on the posterior part of 
the crown. In the lower jaw there are only five molars ; but, as 
the last in the upper jaw is entirely white, and the others all 
brown and less developed, it is possible that a sixth molar might 
subsequently have been developed in the lower jaw. Each of 
the five lower molars has a small tubercle in front, at the base 
of the high conical crown; and the three hinder ones have also 
a more highly developed tubercle on the posterior part of the 
crown, which becomes higher and larger posteriorly. The pala- 
tine bones are deeply excavated anteriorly, and flat behind. The 
hinder margin is retracted forward in the middle, and has on 
each side an obtuse prominent angle, as shown in my drawing. 
The occipital condyles are wanting, and therefore only indicated 
in my figure. 
On Tursio Eurynome. 
The skull of the Dolphin in our Museum which I have called 
Delphinus Euphrosyne, perhaps by a change of the very similar 
names, is not D. Euphrosyne of the ‘ Voyage Ereb. and Terror,’ 
pl. 22, but D. Hurynome, ibid. pl.17, now named Tursio Eurynome 
in your Catalogue, p. 261. The skull agrees exactly with your 
figure, and cannot belong to a different species. The lower jaw 
is wanting, and both sides of the upper Jaw want the tops; in 
the remaining parts there are twenty orifices or sockets for the 
teeth, wanting the five of the top, with that part of the maxil- 
lary bones; but as the intermaxillaries are completely preserved, 
I can hardly be in error as to the portion wanting of the maxil- 
laries. The skull is very old, and may have been brought by a 
vessel from the East Indies to Buenos Ayres; but as it is very 
rare for any one here to take an interest in the preservation of 
such things, I supposed that it must have been obtained in this 
country. 
