Dr. J. Hector on the New-Zealand Bottlenose. 437 



the flanks, but does not extend far bejond the vertical over 

 the vent. 



Form. Head convex ; snout conical ; lower jaw longest. 

 Body fusiform ; greatest height one fifth the total length. 

 Pectoral extremity narrow, falcate, equal in length to base of 

 dorsal; dorsal low, rounded, commences at middle of the 

 back and over the umbilicus. No second Jin-like ridge near 

 the tail. Tail-lobes narrow, falcate, each one third longer 

 than the pectoral. 



Total length 51 inches ; girth 32 inches ; weight 78 lbs. 



inches. 



Snout to anterior margin of pectoral 12 



„ angle of mouth 6 



„ blow-hole 8 



„ commencement of dorsal 24 



,, umbilicus 24 



„ vent 36 



Length of base of dorsal 8 



Spread of tail 15 



Lengtii of anterior margin of tail-flipper 12 



This species thus differs in external characters from the 

 genus Lagenorhynchus as described in Dr. Gray's ' Catalogue 

 of Seals and Whales,' p. 267, in the forward position of the 

 dorsal and the absence of a second fin-lobe on the back. 



The dentition of the specimen in the Museum is as follows, 

 and shows that this character is a reliable one for the distinc- 

 tion of species : — 



Length of lower jaw. Teeth, 



inches. 



1. Complete skeleton 11 32 3 1 



2. J, M 9 



3. SkuU 10 



4. Lower jaw only 12*5 



5. „ „ 12 



6. „ „ 12 



7. „ „ 11 



In every case the three or four front teeth are feeble and 

 irregularly developed, being difficult to observe, 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. 



