242 Transactions.— Zoology. 
the cheeks, where blackish blotches advance some distance towards the nose. 
The cylindrical form of the animal for its length is rather slender, its height 
at the occiput being only 2 feet 3 inches, and at about nine feet from the tip 
of the lower jaw 8 feet 3 inches, after which it tapers gradually to the tail. 
The animal proved to be a young female, 
The two teeth at the termination of the lower jaw stood half an inch 
above the gums, having a diameter of one inch where they rose above the 
latter. They are conical, and have a sharp apex, and are not covered any- 
where with enamel, not even on the tip. The dentine shows a number of 
horizontal lines one above the other, running round the tooth. They are 
therefore quite different from the teeth of the two specimens described in 
Vol. IX. (Transactions of the New Zealand Institute), which were found to 
be covered with a rough cement. They are also different from those of 
another specimen, of which I shall give some details further on. 
A single fold begins below the throat, 1 foot 1 inch from the top of the 
lower jaw. After rising rapidly for four inches, it continues for seven inches 
more at a smaller angle, ceasing where the black colour of the throat begins. 
This fold is separated into two portions by a ridge of the breadth of half an 
inch below the centre of the throat. 
Lips flesh-coloured ; roof of mouth slaty-black ; no signs of teeth along 
the jaws ; there is, however, a hardened ridge along both sides of the palate. 
The extremity of the lower jaw projects about two inches beyond the upper. 
The head rises steeply above the upper lip to the forehead. 
The blow-hole is situated.on the vertex of the head just above the eye, 
Both the form and the size of the dorsal fin and of the tail-lobes, show that 
this species must be a remarkably swift swimmer. 
MEASUREMENTS. 
FT. IN. 
Total length : ee 19 6 
Greatest circumference "e em sc" g 
From point of lower jaw to the beginning of the pectoral fin 4 9 
From fork of tail to termination of faleate dorsal fin 5 Hw 
Length of the opening of the mouth 1-8 
From point of lower jaw to eye . = $503 68 
From point of lower jaw to beginning of fold below throat ti 
Diameter of blow-hole concave towards head /. a 0 8 
From fork of tail to vent Ses 5 4 
From fork of tail to pudendum 6 6 
Breadth of caudal fin .. * 8 1 
Base of dorsal fin = w z ka dr 
Height of dorsal fin .. - ^ & 08 
Breadth of pectoral fin ,. . x : ¢ 1 
Length of pectoral fin .. P» TA wv 2 B 
Eye, horizontal diameter ei S =. DA 
Eye, vertieal diameter .. e 0 1 
