81 



Genus Tussio, 1 Gray. 



Head and forehead convex, shortly beaked ; beak of the skull short, 

 stout, broad, depressed, slightly less than f but more than of the 

 entire length of the skull; skull large, thick, heavy, with a high 

 swollen brain cavity ; symphysis of mandible short, from % to -f of the 

 length of mandibular ramus ; teeth large ; palate flat, not laterally 

 channelled. 



TUESIO TEUNCATUS, 2 Montagu. Bottle-nose Dolphin. 



Synonyms DelpTiinus trimcatus, Montagu, Trans. "Wern. Soc., London. 

 Delphinus tursio, O. Eabricius, Bonnaterre, Cuvier. 

 Tursio truncatus, Gray, S. & W. p. 258 ; Suppl., p. 74. 



Teeth |ffj to ^s, three and a half to the inch ; truncated when old. 



Although this species is common in the European seas, yet there 

 exists a considerable variance in the descriptions with regard to the 

 colour of this animal, which probably may be accounted for by circum- 

 stances usually attendant upon age, sex, or season. It has been 

 described as " black, whitish beneath " ; " all blackish, the belly a 

 little paler ; " " uniform deep black," and "black, deeply tinged with 

 purple, the sides dusky, belly greyish white." The length is commonly 

 about 8 feet, but Cuvier states that individuals have been seen 15 feet 

 long. In the old animal the skull becomes much thickened, the beak 

 broad, flattened, and curved up at the tip in front. 



Inhab : North Sea, the coasts of Great Britain and Ireland, the' 

 Mediterranean, &c. 



TUESIO EBEBENNUS, 3 Cope. 



Teeth &&, large, about two in an inch. 



Inhab. Philadelphia. 



See Cope, Proc. Ac. Nat. Sc. Philadel*. 



TUESIO METIS, Gray. The Metis. 

 Synonym Tursio metis, Gray, S. & TV., p. 256 ; Suppl., p. 74. 



Teeth .^1, conical, acute, curved. 



Skull globular ; beak thickish, conical, evenly tapering, upper part 

 convex. 



Inhab. West Africa. 



Dr. Gray describes this species from a skull obtained during the 

 voyage of the " Erebus " and " Terror." 



1 Tursio, a fish like a dolphin. 



2 truncalus, cut off. 



3 tpfp(vv6s, blackieh, dusky. 



O 



