40 Proceedings of Royal Society of Edinhurgli. 
rnstrata, and of making a number of measurements under more 
favourable conditions than often falls to the lot of the cetologist. 
I propose, therefore, to give an account of the appearance of this 
animal. One of my pupils, Mr Edmund Frost, who is an accom- 
plished photographer, took under my direction several negatives. 
Mr Murray has most liberally presented the skeleton to the 
Anatomical Museum and through the courtesy of Mr Eobert 
Irvine, F.E.S.E., I was enabled to have the skeleton cleaned by 
having it buried for four years in a sand-heap at the Granton Oil 
W orks. 
General Form . — The head was flattened on the dorsum, and 
tapered forwards on each side to a pointed beak. The two blow- 
holes were situated on the dorsum a little anterior to the eyes and 
the angle of the mouth. They were separated from each other by 
a mesial depressed septum, 11 inches long, which bifurcated in its 
posterior half. Immediately in front of the blow-holes, a low mesial 
ridge, triangular in shape, and with the base behind, extended 
forward, and gradually subsided near the tip of the beak. This 
ridge \vas not due to a subjacent ridge of bone, but was formed of 
fat and coarse fibrous tissue, covered by integument ; at its base it 
was 5 inches thick in the mesial plane, but in the lateral slope it 
diminished to IJ inch in thickness. 
The eye was placed immediately above the angle of the mouth, 
and occupied a definite slit in the integument. An inch and a half 
above the eye-slit w^as an antero-posterior depression in the integu- 
ment, 6 inches long, half an inch in depth at its middle, and 
tapering at its two ends. A similar but shallower depression, 44 
inches long, was situated IJ inch below the eye-slit. The external 
meatus of the ear was a minute opening almost in a direct line with 
the eye-slit, and 15 inches behind it. 
From the dorsum of the head the middle line of the back 
gradually sloped upwards and backwards until the highest point of 
the curve of the back was reached, about midway in the length of 
the animal. The deeply falcate dorsal fin was situated on the curve 
of the back as it sloped downwards and backwards to the tail. 
The general form of the body behind the flipper was convex at the 
sides, and the greatest girth was at a point about 3 feet behind the 
axilla. The body then tapered backwards, and in the plane of the 
