110 SPECIMENS OF CETACEA. 



pointed ; pectoral fin ovate, nearly as broad as long. 

 Length 20 to 30 feet, bulk}', rapacious ; teeth 

 strong, with fangs expanded laterally. Vertebral 

 formula €70^^ or j2LioCdo3 = 51 or 52. 



1. Skull, adult; length 3 feet 1^ inch, breadth 22f inches; 



beak 1 foot 9 inches long, 18 inches broad at base. 

 Mandible 2 feet 8 inches long, symphysis 6^ inches. 



Teeth — — , massive, conical, points blunted ; surface 



of premaxilla in front of nares broad and concave, 

 the concavity extending half length of beak, when 

 the bone flattens, widens out towards tip to 2f inches. 

 Pterygoids separated by a moderately wide cleft. 

 Summit of nasals slightly higher than ridge on vertex 

 cranii. 

 Newfoundland, 1877. Donor — Dr A. J. Harvey. 



2. Skull of Orca of a herd of nineteen captured in Bressay 



Sound, Shetland, in February 1871. They varied in 

 length from 17 to 24 feet. Skull 2 feet 8 inches 

 long, 16| inches broad ; beak 17 inches long, 10 inches 

 broad at base. Mandible 26 inches long, breadth at 

 condylar end 7| inches, symphysis 4f- inches. Teeth 



r— —, conical, not so much worn as ni JNo. 1. 



Summit of nasals about 1 inch higher than ridge on 

 vertex cranii. Specimens of placenta, Nos. 8 to 14, 

 were from a gravid female of this herd. 



Donor — John Gatherer, Esq. 



3. Skull of Killer Whale found in a field at Orchard farm, 



near Tullibody House. The skull was exposed about 

 20 inches from the surface and about 20 yards from 

 an embankment which protected the field from the 

 channel of the Forth. The skull is 20| inches broad ; 

 the snout is broken. Probably stranded and buried 

 in the field. Turner Collection. 



4. Tympano-periotic bones, left, not articulated. Tjnnpanic, 



length 2| inches, breadth Ih inch, height Ij inch; 

 outer surface convex, lip-like process confined to 

 upper border ; inner surface concavo-convex, striated, 

 gradually diminishing in height at anterior end ; 

 inferior surface bilobed; outer massive, rounded, pro- 

 jecting for ^j^ inch; inner flattened, much smaller, pro- 

 jecting only ^(^ inch ; cleft wide, deep : inferior surface 

 rough, ridged at inner border, outer border blends with 

 outer surface ; cavity slopes to end in a wide mouth 



