Hector.—New Zealand Cetaceans. 165 
Inches, 
Width of occiput : aes sie ee a 
Length of beak from eadi aad 18 
Brain cavity—length . 6 
Sperm cavity—length .. 12 
width . 5 
Width of beak at 12 ste feos pa 5 
Lower jaw—length 30 
height of ramus 7 
Weight of teeth 817 and 836 grs. 
The beak is trigonal, obliquely truncate, and slightly upturned, three 
times the length of the brain cavity; vomer is small, fusiform, truncate 
posteriorly (probably from its having been broken off in opening the sperm 
cavity) callous and depressed in a groove that is formed by the thin callous 
margin of the intermaxillaries, which are continued backwards to form a 
moderately high ridge, inclosing an oval basin, and rising to a deeply-notched 
crest that overhangs the blowers at the level of the supra-occipital crest ; 
the beak is slightly unsymmetrical at the point, being twisted to the right; the 
blowers are strongly twisted to the left; the maxillaries are slightly elevated, 
inclosing a lateral groove on each side of the beak, which groove expands 
backwards to form shallow supra-orbital basins. 
On the lower aspect of the beak there are imperfect dental grooves, but 
no tooth sockets, nor any acute tubercular granulations as described in 
E. desmarestii. 
The lower jaw projects three inches beyond the beak, the thin callous 
rami having straight, entire, upper margins as far as the commencement of 
the symphysis, where they curve upwards and end in a conical, truncate 
point, which is level with the upper surface of the beak when the 
mouth is closed, and terminates in two short, stout, slightly compressed 
teeth (Pl. V., 2a. and b.), two inches long and four in circumference, im- 
planted in shallow sockets. The teeth have slight irregular striæ, and are 
worn down into two lateral facets divided by an acute ridge. The position of 
‘the teeth, when the jaws are closed, is two inches beyond the upper mandible, 
and unless they are applied against callosities on the upper lip it is difficult to 
. conceive how they are worn down to this acute form. Two teeth of similar 
form, taken from the jaw of a whale cast up on the Manawatu beach, have 
their facets forming an obtuse pyramidal tip (Pl. V. 3.) A shallow dental 
groove extends back from the tooth sockets for fifteen inches with well marked 
nutrient foramina that indicate twenty-two suppressed teeth. 
Only two species of Epiodon are known, and it is possible that the above 
may be identical with Epiodon australis from Buenos Ayres, the description of 
