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 1 1. 

 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 thi'ee 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/ 

 pi. 22, hut D. Eurynome, ibid. pi. 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, 

 1 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. 



