448 
Proceedings of the Royal Society 
Grey or whitish streaks and spots scattered irregularly on the sides. 
Dorsal fin nearer the tail than the head, falcate posteriorly. A 
dorsal keel in front of tail. No median notch between lobes of 
tail. Flipper small ; both its anterior and posterior borders convex. 
Blowhole semilunar, concave forward, not quite symmetrical. Mouth 
slit straight in front, but concavo-convex further back. A pair of 
furrows converging in front on the under surface of the throat. A 
pair of laterally compressed triangular teeth protruding in the male 
between the lips at the side of the beak ; not visible in the female. 
Budimentary functionless teeth present in the gum both of the 
upper and lower jaws. 
Of the thirteen specimens which have been captured, the whole 
of the skull, or a portion only, has been kept in twelve instances ; but 
in six specimens only, including the one from Shetland, have the other 
bones of the skeleton been more or less perfectly preserved, viz., in 
the Brussels, Caen, Dublin, Goteborg, and Edinburgh University 
Museums. Only one skeleton has been described and figured in 
detail, viz., the immature female in the Brussels Museum, originally 
by M. Dumortier,* * * § but subsequently and more in detail by M. 
Van Beneden. t Several of the crania have also been figured and 
described, viz., the Oxford, Paris, Caen, and Edinburgh Museum 
of Science and Art specimens ; whilst some facts connected with the 
other bones of the skeleton in the Caen and Goteborg skeletons 
have been recorded by M. Gervais J and the Messrs. Malm. § 
The animal captured in Shetland was an adult male. All the 
epiphysial plates were fused with the vertebral bodies, and the 
teeth were fully erupted. Three of the lumbar vertebrae had 
irregular osseous excrescences on the bodies. One lumbar spine 
had a ridge crossing obliquely about its middle, as if it had been 
fractured and repaired during life. 
The end of the rostrum of the skull had unfortunately been 
broken off to the extent probably of 5 or 6 inches, and the anterior 
end of the mandible had also been broken away. Owing to this 
injury I cannot give the full length of the cranium ; but the skull 
* Mem. dc VAcad. Roy. de Belgique , xii. 1839. 
f Mem. Couronnes de V Acad. Roy. de Belgique, Oct., xvi. 1864. 
X Osteographie des Cetaces, p. 397. 
§ Opera citata. 
