162 Transactions.—Zoology. 
The dentition of the various specimens in the Museum is as follows, and 
shows that this character is a reliable one for the determination of species. 
Length of lower jaw. Teeth. 
2 
1. Skull of complete skeleton ... vas 11: a = = 
31-31 
2. is 3 os aK vat 9 eer 
3. Skull... i = Sercio ai 
4. Lower jaw ase S: ie: 12:5 ao p 
” ” 12: ai oy 
6 ” 3 eee ee eee 12: 31 31 
i: ” ” nee tes ik a or ge: 
In every case three or four of the front teeth are feeble and irregularly 
developed, the variation in the numbers observed depending on the condition 
of this part of the jaw. 
The other teeth are cylindrical and acutely incurved, the middle ones being 
the best developed. 
TURSIO METIS. 
T. metis, Gray, l.c. 256, 
Animal unknown. Skull globular; back of blower tubercular ; rostrum 
thick, conical, tapering, longer than head, and more than twice as long as 
width at notch ; intermaxillaries convex and more than half the width of the 
beak ; triangle extends to the commencement of the tooth series ; teeth large, 
the sockets being half an inch from centre to centre, = ~ = 
To this species, which is founded on a single skull in the British Museum, 
the habitat of which is unknown, I refer a skull obtained by Mr. T H. 
Potts at Dusky Bay, which has the following measurements :— 
Inches. 
Length wee isk a we sa i 
Width at orbits kis E ve am ore 
Re notch ai sai as vos wi ee 
middle of beak =a wre ‘ts oe ae 
Length of beak is Bi as ee mao ALO 
j lower jaw z tes oe 17:5 
y dental groove Sei e kO 
The teeth are wanting, but the lower jaw appears to have had a slightly 
larger terminal tooth on each side directed obliquely forwards. The tooth 
sockets are very large, and nearly an inch in depth. The lower jaw is very 
stout, 
