152 Mr. W. Thompson on ihe occurrence of 
: ft. in. 
Caudal fin, greatest length .........s000.. ceeesesceccecnseesereeceseneewes 2 42 
ih, greatest bredata ). i ia a eesaeeuaneed es aia | 
fin; greatest thickness... iiveikscdisevdiassecsccssdweieaeeee ae | 
Aperture anterior to vent in length ......ccccecsscessssssecosssereseens ae 
Of vant In LENOtR . axstvdsdesinensansegsnsinaeessshannei lien Go 6 
“The marking at each side from behind the lip, extending 
under the chin in the direction of the belly, is fourteen inches in 
length ; in breadth it is two inches anteriorly and nine inches 
posteriorly*. Colour when quite recent of a blackish lead hue, 
and the skin, which was exquisitely thin, beautifully polished 
like patent-leather, and more especially so on the tail and caudal 
fin: it was merely of a lighter shade beneath and not white. No 
teeth visible.” 
Although no teeth could be seen when the animal was en- 
tire, the removal of the fleshy portion of the lower jaw ex- 
posed four.of them towards its extremity. They are loose in their 
sockets, and so deeply sunk in the groove as not to be apparent 
above the bone when the jaw is viewed in profile. Though loose, 
the two front teeth may be stated as 7} lines from the extre- 
mity of the jaw, and the hinder pair as 9 lines distant from them. 
The accompanying sketch (Pl. IV. fig. 1) which I made of them, 
represents the teeth and jaw of natural size. So much has already 
been written on the teeth of this species, that I shall content 
myself with merely calling attention to the very small size of the 
anterior pair in the present individual—a male upwards of twenty- 
three feet in length—compared with those represented in Owen’s 
‘ Odontography,’ pl. 88. fig. 1, although the Hyperoodon to which 
the latter belonged is said to have been immature, p. 347. The 
stomach of the Irish specimen was quite empty. It was believed 
that this animal, which was in the highest. condition, would have 
been about five tons in weight ; it produced above ninety gallons 
of oil: the entire skeleton has been preserved for the Belfast 
Museum. | 
Baussard’s figure of the Hyperoodon (as repeated in F. Cuvier’s 
‘Hist. Nat. Cetacés, pl. 17. fig. 1) would with some corrections 
represent this specimen; but it has seemed to me desirable to 
have an outline of it engraved from the drawing already alluded 
to, zoologically corrected by myself (PI. IV. fig. 2). The differ- 
ence between Baussard’s and the Irish specimen will be seen to 
consist in the latter being less elongate; in its dorsal fin being 
smaller, and placed considerably farther back; in its eye being 
round instead of oval like the human eye, and in its being defi- 
* These are evidently the same as the ‘‘ two diverging furrows ”’ described 
as ‘under the throat” in the Physeter bidens of Sowerby ; they were said 
in the Irish specimen under consideration to have resembled the healed-up 
deep wounds in the stem of a large tree. 
