280 



ANATOMY or VERTEBKATES. 



159 



Skeleton of Right Wliale (BaUenav)iisUcetHS}. 



LXV. 



ing^ to modifications of the loco- 

 motive organs, into three series ; 

 viz. Mutilata, Ungulata, and Un- 

 guiculata, the maimed, the hoofed, 

 and the clawed series ; and these 

 are of higher value than the or- 

 dinal divisions of the Lissence- 

 phala; just as those orders are of 

 higher value than the representa- 

 tive families of the Marsupials. 



The Mutilata, or maimed 

 Mammals with folded brain, are 

 so called because their hind-limbs 

 seem, as it were, to have been 

 amputated, fig. 159, G6 ; they pos- 

 sess only the pectoral pair of 

 limbs, and these in the form of 

 fins, ib. 54 : the hind end of the 

 trunk expands into a broad, hori- 

 zontally flattened, tegumentary 

 caudal fin. They have large 

 brains with many and deep con- 

 volutions, are naked, and have 

 neither neck, scrotum, nor ex- 

 ternal ears. Like the wingless 

 group among Birds, the present 

 includes species allied to, or de- 

 rived from, different types. 



The first order, called Ceta- 

 CEA, in this division are either 

 edentulous, fig. 159, or monophy- 

 odont: the latter have teeth of one 

 kind and usually of conical shape : 

 the pectoral digits, ib. iii., may 

 have more than three phalanges. 

 They are testiconda and have no 

 ' vesiculse seminales.' The mam- 

 mae are pudendal ; the placenta 

 is diffused ; the external nostrils 

 — siuo-le or double — are on the 

 top of the head, and called spi- 

 racles or 'blow-holes.' They, for 

 the most part, range the ocean ; 



