ORCELLA — ORCA. 109 



(1) Orcella BREVIROSTRIS. (Oc. BR.) 



Phoc?Bna brevirostris, Owen, Trans. Zool. Soc, vol. vi. 



1. Skull, adult; length 11^ inches, breadth 7| inches; beak 

 length 5 inches, breadth at base 4^ inches ; mandible, 

 length 8f inches, height at condylar end 3 inches, 

 length of sjanphysis 1/^ inch. Cranium globose ; 

 vertex cranii on same plane as top of nasals, which 

 are small, j^^y inch wide and free for only j3__ inch ; 

 occipital region arches backwards and downwards. 

 Beak short, wide at base in relation to length. Pre- 

 maxillaries smooth and concave in prenarial region, 

 then slightly convex and ^'o inch broad ; mesethmoid 

 visible as far as the end of the concave surface. 

 Maxillffi roughened and forming outer margin of 

 beak, though concealed at the tip. Pterygoids 

 separated mesially by a wide cleft. Palate bones 

 arched from mesial suture outwards and backwards, 

 only ^j^ inch in antero-posterior diameter. Teeth, 

 only one present in each maxilla, but anterior to it 

 are six empty sockets ; indications of sockets much 

 further back, as if the more posterior sockets and 

 teeth disappeared early in life ; in the anterior end of 

 each mandible twelve short teeth, conical and worn 

 at the tips. The tympano-periotic bones are absent. 

 Donor — Dr Nelson Annandale. 



VII. ORCA. (0.) 



Orca, Gray, Zool. Erebus and Terror, 1846. 



Colour glossy black on head and back, venter white 

 prolonged into the side, white spot near eye ; teeth 

 large ; pectoral limb ovate, large. Head broad, de- 

 pressed ; dorsal fin at middle of back, high. 



(1) Orca gladiator. (O. g.) 



(Killer Whale or Grampus.) 



Delphinus orca, Linnceus, Syst. Nat., 1766. 



Orca gladiator, Gray, Zool. Erebus and Terror, 1846. 



Colour black on dorsum and sides, white on venter, 

 with a broad white band indenting the black side ; 

 dorsal fin at middle of back, very high, falcate. 



