162 



Transactions. — Zoology. 



The dentition of the various specimens in the Mnseiini is as follows, and 

 shows that this character is a reliable one for the determination of species. 



Length, of lower jaw. Teeth. 



1. Skull of complete skeleton 



9 



■"• >) )> )j 



3. Skull ... 



4. Lower jaw 

 ^- J? » 



6. „ » 



7 



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. 





32 



31 



11- 



31 ~ 



31 



9- 



31 



31 



" 31 



31 



10- 



32 

 31 



31 

 31 



12-5 



31 ~ 



32 



12- 









31 ~ 



31 



12- 



_ 







31 



31 



11- 



31 ~ 



31 



TURSIO METIS. 



T. metis, Gray, I.e. 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. 

 21- 



lo- 

 ss 



3- 



11-5 

 17-5 

 10- 



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, 



Length 



... 



Width at 



orbits 



>5 



notch 



J5 



middle of beak 



Length of beak 



>5 



lower jaw . . . 



?> 



dental groove 



