304 Dr. H. Burmeister on Ziphiorrhynchus. 
are situated in the narrow channel running backward from the 
alveoli of the larger teeth, as shown in fig.3. The upper jaw 
has a similar but smaller channel, which is indicated, in fig. 1, 
at the side of the upper jaw near J, as a dotted line (.+««..). 
In this figure, b indicates the maxillary bone, and a the inter- 
maxillary. 
In the whole Jongitudinal line between the two intermaxillary 
bones there is a deep channel, beginning at the top of the upper 
jaw, as shown in fig. 3. The vomer is situated in the bottom of 
this channel ; and behind the vomer there is a strong cylindrical 
cartilage, which goes from the top of the jaw to the nasal open- 
ing, where it unites with the high septum of the vomer between 
the two apertures, as shown in fig. 2. 
The intermaxillary bones are enlarged behind, and somewhat 
excavated, rising into a high protuberance on the forehead, the 
right maxillary bone being much larger than the left, as you 
may see in my drawing (fig. 2). In the middle of this pro- 
tuberance are situated the nasal bones (fig. 2 0 0), which are also 
unequal, the right being stronger than the left, and forming a 
large and thick promontorium between the intermaxillary bones. 
On the outside of the maxillary bone (0) is situated the frontal 
(d), forming an arch over the eye on each side, and ascending 
like a small narrow band at the hinder margin of the maxillary 
bone to the top of the protuberance in the highest part of the 
skull. Behind these comes the large parietal bone (c) in the 
middle of the cranium, and on the sides the temporal bones (/), 
having on the underside the ear-bone or os petrosum (g). The 
posterior margin of the temporal is united with the occipital 
bone (A). The zygomatic bone is very curious; it forms a 
thin cylindrical arch, united in front of the eye with the frontal, 
but not reaching the temporal bone behind. 
The skull is 34 centim. in breadth at the broadest part, in the 
middle of the superciliary arch ; and the protuberance is elevated 
20 centim. above the horizontal part of the upper jaw in the 
same region of the skull. I hope you will understand all 
thoroughly by examining my drawings. (Plate VI.) 
The other parts of the skeleton closely resemble the figures 
given by Vrolik in his account of Hyperoodon (in the Transac- 
tions of the Academy of Haarlem, 1848, vol. v. p.1). I have 
this very valuable description of the Hyperoodon, the only scien- 
tific work on whales in my library, except yours in the ‘ Voyage 
of the Erebus and Terror.’ The neck has the same construction, 
and has also seven vertebre, the first four being united into one 
piece, and the other three separate. The arches of these three 
vertebree are open above, as is also the arch of the first dorsal, 
which is very small and united on the left side with the arch of 
