BAL^NA. 29 



53. Eyeball. Annular section through the equator of the 



sclerotic of B. mysticetus, showing the apertures of 

 the vasa vorticosa. 



54. Ear. Three blocks of the integument surrounding the 



meatus auditorius externus of a B. mysticetus, show- 

 ing the differences in size of the meatus at its deep 

 end and as it approaches the surface. The whale was 

 a male 40 feet 6 inches long, and the meatus opened 

 16 inches behind the posterior canthus of the eye. 

 See Dr Robert Gray, Journ. Anat. and Phys., vol. 

 xxiii., 1889. 



(2) Bal^na australis. (B. au.) 



(SouLliern Right Whale.) 



Balaena australis, Desmoulins, Diet. Class d'Hist. Nat., 

 ii. p. 161, 1822. 



Body smaller than B. mysticetus, head relatively 

 smaller, baleen shorter, ribs fifteen pairs. 



1. Vertebrae, cervical and 1st dorsal, fused into one mass. 



The inferior transverse processes are present in the 

 2nd, 3rd, and 4th cervicals, but not in the 5th, 6th, 

 and 7th. The block was marked " Bight Whale of 

 New Zealand," captured at Kaipara. See Turner, 

 Chcdlenger Reports, vol. i., 1880. 



" Challenger " Collection. 



2. Tympano-periotic bones, right, fused, with long mastoid 



process; length 5 inches, breadth 3 inches, height 

 4^ inches ; wide cleft behind lip-like process. Outer 

 and inner surfaces closely correspond with B. biscay- 

 ensis ; upper border of inner surface relatively thin, 

 3 inches above keel ; Eustachian end deeply notched. 

 Keel strongly projecting, adjoining surfaces laterally 

 compressed. Periotic, length 2f inches, breadth 

 If inch. Auditory canals wide and long. Tympanic 

 ossicles absent. 

 From Te-Awite, New Zealand, September 1888. 



Purchased — Turner Collection. 



3. Tympano-periotic bones, left, fused, with long mastoid; 



length, breadth, height, and other characters as 

 above. 

 From Te-Awite, New Zealand, September 1888. 



Purchased — Turner Collection. 



