738 
PROFESSOR OWEN ON THE JMEGATHERIUM. 
a tuberosity, in the lumbar vertebrae. There are no anapophyses. The back part 
of the diapophysis of the last lumbar presents a distinct articular process for a cor- 
responding one on the fore-part of that of the first sacral vertebra. 
In the Sumatran Tapir {Tapirus Malay anus), a very distinct metapophysis projects 
upwards and forwards from the fore-part of the transverse process of the third 
dorsal ; it becomes a thicker and lower tuberosity above the diapophysis on the four 
succeeding vertebrae : then again becomes prominent, with a rounded anterior edge 
in the succeeding dorsals, projecting from the fore-part of the diapophysis in the four 
last dorsals, where that process is raised above and is distinct from the rib, and 
projects upwards and outwards. In the lumbar region the metapophysis is very 
distinct, and does not pass upon the prozygapophysis until the last lumbar*. There 
are no anapophyses. 
Tribe Prohoscidia. 
In the Asiatic Elephant {ElepJias Asiaticus), with d 19, /4, the metapophyses pre- 
sent a character different from that in all other Ungulata ; they are first recognizable 
as an obtuse point projecting forwards from the fore-part of the diapophysis of the 
sixteenth dorsal vertebra ; in the seventeenth the metapophysis has assumed a sub- 
depressed quadrate shape, and projects obliquely outwards and forwards from the 
outside of the prozygapophysis : in the eighteenth dorsal it extends forwards, and 
overlaps an anapophysis developed from the back part of the diapophysis of the 
seventeenth dorsal, and these accessory joints continue between the succeeding 
vertebrae as far as the first and second lumbars. The anapophyses have disappeared 
in the third and fourth lumbars, in which the metapophyses are reduced to short 
thick tuberosities, still projecting, not from above, but quite external to, the prozy- 
gapophyses. The metapophyses are continued along the sacral and caudal vertebrae, 
and in a large proportion of the latter supersede the prozygapophyses. 
Order Sirenia. 
In the Dugong {Halicore indicus) there is a feeble rudiment of a distinct metapo- 
physis on the outer side of the prozygapophysis of the fifth dorsal ; but the homo- 
types of the metapophyses are so little developed in the preceding vertebrae, that the 
change of aspect of the articular surface seems to be due exclusively to a gradual 
change of position in the anterior zygapophyses themselves. ^ 
Order Cetacea. 
In the small Bottlenose Whale {Delphinus Tursio), the metapophysis (m) begins to 
project from the fore-part of the diapophysis (d) of the third dorsal, increases in length 
* Straus-Durckheim’s term ‘ anapophyse antoblique,’ applied to these processes in the Cat, would be quite 
inappropriate and unintelligible if applied to their homologues in the Tapir. 
