42 SPECIMENS OF CETACEA. 



the mandible and with that of the temporal bone 

 above. On vertical section no trace of synovial cavity 

 or articular cartilage was noticed between it and the 

 bones to which it belonged. It formed a suspensory 

 column for the lower jaw, which could be supported 

 by it without the aid of muscles, when the whale was 

 feeding with the mouth open. Figure below. 



8a. Skull, much injured. Beak characteristic in form, 

 length 12 feet 6 inches, breadth 7 feet; from foramen 

 magnum over vertex to tip of beak 20 feet 3 inches ; 

 breadth at tip of beak 7 inches ; between the orbits 

 9 feet 3 inches ; measures of occiput, see Introduction, 

 p. 6. Longniddry whale, figure, p. 40. 



4. Nasal bones of the same animal, showing long spur-like 



process from outer border ; faint ridge on inner 

 border ; upper surface convex from behind forwards, 

 sloping rapidly downwards and forwards ; long 

 diameter of each bone 18i inches, greatest trans- 

 verse diameter Qh inches. 



5. Tympano-periotic bones, left, of the same, fused together ; 



the tympanic ossicles are present. Length of tym- 

 panic 5 1 inches, breadth 2f inches, height 3 inches. 

 The outer surface, strongly convex from above down- 

 wards and from before backwards, consists of two 

 divisions separated by a short, moderately wide 

 groove; the posterior extends 3 inches from the 

 groove, and the anterior 2f inches. The lip-like 

 process projects upwards, and is separated from the 

 rest of the posterior lobe by a much narrower groove. 



