l'*^//-] Mil. H. LEK ON RISSO'S GRAMPUS. 809 



ft. in. 



Anterior edge of upper lip to angle of mouth . . 9 J 



Length of eye-aperture 1 



Pectoral fiii ; length from junction of anterior edge 



with bod3' to tip 1 2 



Pectoral fin, from junction of posterior edge with 



body to tip Oil 



Pectoral fin, breadth at base Q 5 



Dorsal fin, heigiit in perpendicular line 9 



Dorsal fin from base to tip, following curve of an- 

 terior edge 1 6 



Breadth of caudal fin 1 9 



Sex. — Male. 



The number of vertebrae is precisely the same as that given by 

 Professor Flower as found in an individual of this species, 10 feet 

 long, taken in a mackerel-net near the Eddystone Lighthouse, on 

 the 28th of February, 18/0 ; and also exactly coincides with the 

 number found by M. Fischer in a specimen of Grampus griseus, 

 9 feet 2 inches long, stranded in 1867 on the coast of La Gironde, 

 France, and taken to Arcachon. 



Although the absence of teeth in the upper jaw is constant and 

 persistent, the dentition in the lower jaw varies considerably in this 

 species. In Cuvier's specimen, described by him as Delphinus 

 griseus from a skeleton and drawing sent to the Paris Museum from 

 Brest, there were only two teeth on each side of the mandible, all 

 much worn. In M. Fischer's specimen, already referred to, the den- 

 tition was the same as that of our Brighton Grampus ; and of four 

 others mentioned by D'Orbigny as having been stranded near I'Ai- 

 guillon. La Vendee, and recognized by F. Cuvier as identical with the 

 Brest specimen, one, a young one 7 feet long, had the same number 

 of teeth, namely four on each side of the lower jaw ; whilst two 

 older ones had respectively six and seven, blunt, carious teeth 

 similarly placed. In Professor Flower's adult individual, there 

 were jf^. If the identity of " Risso's Dolphin " with Grampus 

 griseus be accepted, the variation extends even to ^• 



The colour of our Grampus from Sidlesham was the same as of 

 those described by D'Orbigny, and of the specimen which ran 

 aground, in the Isle of Wight, in the spring of 1843, the skull 

 of which is in the British Museum — namely, bluish-black above and 

 dirty white beneath. From the prevalent colour of this Isle-of- 

 Wight specimen being black and not grey. Dr. J. E. Gray changed 

 its specific name to " cuvieri," considering that the word griseus 

 gave a wrong impression of the animal, and that Cuvier was induced 

 to call it so by the bad colouring of the drawing sent to him. 



Professor Flower has so fully described this species and every thing 

 of interest relating to it in his very complete and elaborate paper 

 published in the ' Transactions of the Zoological Society,' vol. viii, 

 part 1, March 1872, that I need only refer, for further information, 

 to that admirable memoir. 



