GRAMPUS. 121 



(1) Grampus grlseus. (Gr. g.) 



(Risso's Dolphin.) 

 Delphinus griseus, G. Cuvier, Ann. Mus., xix., 1812. 

 Grampus griseus, Gray, Spicil. Zoologica, 1828. 

 Delphinus rissoanus, Gray, Zool. Erebus and Terror, 1846. 



Apparently the only species; may reach 13 feet in 

 length. Skull massive ; beak wide at base, obtuse 

 at apex, one-half length of skull ; premaxilla some- 

 what convex ; pterygoids prominent, in contact in 

 the median line. The Museum contains two 

 skeletons and three separate skulls from a school 

 of nine, six of which were captured off Hillswick, 

 Shetland, in September 1889. The specimens were 

 obtained through Dr Charles Anderson of Hillswick. 

 They varied in length from 8 feet 7 inches to 10 feet 

 5 inches. In the mandibular dentition, two skulls 



were -r -r, four were -^ jr. See Sir \Vm. Turner in Proc. 

 4 4 3 3 



Roy. Phys. Soc. Edin., vol. xi., 1892. 



1. Skeleton, male, articulated, with dorsal and caudal fins 



and pelvic bones ; length 9 feet 10 inches. Vertebral 

 formula C^Dj.^LCd^g = 68. This and the other specimens 

 of Risso's Dolphin were in the Turner Collection. 

 Shetland, 1889. 



2. Skeleton, female, articulated, with dorsal and caudal fins, 



pelvic bones and hyoid ; length 9 feet 9 inches. 

 Vertebral formula CyD^^LCd. 

 Shetland, 1889. 



3. Skull, with mandible; length 19| inches, breadth 13 



inches; length of beak from maxillary notch 10 j 

 inches, breadth at base 7^ inches ; nasals a little 

 higher than ridge of vertex cranii ; premaxilla convex 

 in front of nares, its width being 2f inches, not quite 

 concealing superior maxilla at end of rostrum ; teeth 



acute, moderate, --^; pterygoids large, almost in con- 

 o o 



tact mesially. Mandible 15^ inches long, symphysis 



2\ inches. 



Shetland. 



4. Skull, with mandible; length 19 inches, breadth 12| 



inches ; length of beak from maxillary notch 9^ 

 inches, breadth at base 7 inches ; characters as in 



