432 Transactions.—Z vology. 
Fie in. 
Mandibular tooth, right, length .. "M 5.0, 218 
» » » greatest breadth a Hs U UTE 
) » weight, 184 grains. 
It will ie seen in comparing its dimensions with those of the skull from 
the Chatham Islands, figured and described by Dr. Hector,* that it is larger 
and more developed, with the exception of the two mandibular teeth, which 
are much smaller in the Chatham Island specimen, and evidently are 
designed for other purposes. The rostrum, of which the point is broken 
off, is of small dimensions when compared with the posterior portions of the 
cranium, its point being slightly turned to the right. This point was 
shattered into such a number of small pieces, so that after macerationit was 
impossible to secure them all. The same was the case with the lower jaw, 
so as to suggest that the animal had struck the reef, and thus injured so 
considerably that portion of its frame. 
The premaxillaries are two thin bones, which run parallel in their 
anterior portion. They here curve inwards, so as to form a semi-cylindri- 
cal excavation, running along the whole rostrum as far as the septum 
narium. 
Before reaching this, however, they alter somewhat their general form, 
the rounded edge disappearing, the bones now showing a plane, rather con- 
cave surface, and gradually rising near the posterior end of the nares, unite 
here with the nasal bones, by which a high crest is formed. 
For about one-third from the point both sides of the premaxillaries are 
alike, after which the right one becomes much broader than the left one, 
and passing over the median line of the skull to the left, the skull now 
becomes very trical in its central portion, so that the opening of the 
nares is displaced to the left. Moreover the uppermost portion of the right 
premaxillary, besides being broader, is much higher than the left one—a 
peculiarity to which also the nasal bones conform, the right one being con- 
siderably higher than the left one. 
The prefrontals (of Owen) begin 6:50 inches from the anterior point of 
the rostrum, gradually widening to one inch, being slightly eoncave in the 
centre for a length of eight inches. They then gradually flatten for a dis- 
tance of one ineh, after which they become convex, until they rise and form 
the thin ridge of the septum narium. The latter is wedged in its anterior 
portion against the left premaxillary, and then continuing its direction to 
the left joins then obliquely the nasal bones. In the centre of the nares 
the septum narium is exeavated for a depth of nearly two inches and a 
width of 1:20 inches, the bone having here : a very sharp edge. - _Bhortly 
7 Loc. P 
