BAL.ENADJE. 207 



out claws ; hind limbs wanting ; tail terminated 

 by a broad cartilaginous fin, set on horizontally ; 

 windpipe opening at the summit of the head by 

 one or two blow-holes. 



Head enormously large. 



Muzzle rounded ; upper jaw fringed . Balcenadte. 

 Muzzle truncate ; upper jaw simple . 



Head moderate 



FAMILY I. BAL^ENAD^E. 



Head disproportionately large, with a sloping, 

 rounded muzzle ; upper jaws fringed with trans- 

 verse plates of a horny substance (whalebone) ; 

 both jaws destitute of teeth ; blow-hole single. 



Balanoptera (Lacep.) Rorqual. A small dorsal 

 near the tail ; throat and belly wrinkled with deep 

 folds. (The largest of known animals.) 



B. rostrata. Fig. 327 ; ^Q n. s. 



327 



Balcena (Linn.). Eight-whale. No dorsal; belly 

 smooth ; whalebone very deep. 



B. mysticetus. Fig. 328 ; ^ n. s. 



