Oeca giadiatoe,/ Bonnaterre. The Killer. 



Synonyms — DelpJiimis orca, Linnfens. 



Delj}Mniis f/Iadiator, Bonnaterre. 



Delphinus grampus, Owen. 



Orca gladiator, Sundevall ; Gray, S. & W., p. 279. 



Ardhchsoak is the name of the Greenlanders for the male, 

 and Aidluih for the female. 



The males are much larger than the females. 



Colour black above, shading into white on the abdomen, with usually 

 a more or less developed white patch above and somewhat behind the 

 eye. 



The size of the adult males may be estimated at from 19 to 25 feet 

 in leni,'th, with a girth varying from 10 to 12 feet ; but aged animals 

 have been captured which have measured 30 feet long. The body is 

 elongated and muscular, exhibiting a structure highly expressive of 

 speed and enormous strength. 



NOETHEEX VAEIETIES. 

 Oeca stenoehtncha,^ Gray, Suppl. S. & W., p. 90. 



Teeth 14^1 ; length of skull, 35 to 37 inches. 



Colour of animal black ; circumscribed spot behind the eye ; spot on 

 belly ; and under side of tail white ; length 21 feet 3 inches. 

 Inhab : North Sea. 



Oeca latieosteis,^ Gray, Suppl. S. & W., p. 91. 



Skull very similar to that of Orca capensis, but much smaller, and 

 distinguishable from the skull of the Orca stenorhyncha " by the 

 smaller size and broader, rounder nose." 



Inhab : North Sea. 



Oeca eectipinna. Cope, Pro. Acad. Nat. Sc, Philad., 1869, p. 12. 



Differs from the Orca stenorhyncha of Gray, and the Orca ater of 

 Cope, by having no white spot behind the eye. 



Oeca atee. Cope, Pro. Acad. Nat. Sc, Philad., 1869, p. 92. 



Is known from being black above and below, but with a white spot 

 behind the eye. 



Inhab : Oregon, Aleutian Islands. 



' ffladinior, a liector, a bully. 



^ From (Trev6s, narrow, and ^vyxos, beak. 



^ lafus, wide, broad, and rostrum, beak. 



