726 
PROFESSOR OWEN ON THE MEGATHERIUM. 
development of its metapophyses ; but differs in the relatively smaller size of its body 
and its shorter neural spine. 
In a mature Sumatran Orang (Pithecus Abelii), with 12, / 5, the metapophysis 
appears as a tubercle near the base of the prozygapophysis of the twelfth dorsal 
vertebra. It is equally distinct on the first lumbar, but subsides to a slight eminence 
on the succeeding vertebrae. The anapophysis is only distinguishable from the dia- 
pophysis upon the first lumbar vertebra; where, however, it well illustrates the homo- 
typal relation of the diapophysis to the same processes in the antecedent dorsal and 
the succeeding lumbar vertebrae. 
In the Hylohates syndactyla, with d I b, the last dorsal shows well the distinct 
diapophyses, metapophyses, anapophyses and zygapophyses, more especially the 
distinction between the prozygapophysis and the now superadded metapophysis. 
The diapophyses progressively increase in the first three lumbar vertebrae, whilst 
the anapophyses diminish and disappear on the third lumbar. The metapophysis 
recedes from the prozygapophysis in the last lumbar vertebra, and becomes quite 
distinct from it on the first sacral, in which, nevertheless, the articular surface has a 
nearly vertical position. 
In the Silvery Gibbon {Hylohates Leuciscus), with ^^13, /5, both metapophysis and 
anapophysis become distinct on the twelfth dorsal, and diverge from each other with 
increase of size on the thirteenth. The anapophysis disappears* in the lumbar ver- 
tebrse, but the metapophysis is retained. 
In the Papas Monkey {CercopitJiecus ruher), with d 12, I 7, the metapophyses and 
anapophyses are separate and distinct upon the eleventh dorsal vertebra, and also in 
the succeeding vertebrae to the penultimate lumbar, where the anapophysis, which is 
remarkable for its length in the preceding vertebrae, disappears. 
In the Wrinkled Monkey {Blacacus rhesus), the common rudiment of the meta- 
and an-apophysis, situated upon the diapophysis in all the dorsal vertebrae, progres- 
sively increases and elongates as the dorsal vertebrae recede from the neck, and 
divides into the two distinct processes upon the ninth dorsal. The metapophysial 
tubercle ascends upon the prozygapophysis, and is continued throughout the lumbar 
series ; the anapophysis increasing, as in Cercopithecus, in the anterior lumbars so as 
to underlap the prozygapophysis of the succeeding vertebra, disappears in the last 
lumbar. 
In the Entellus Movikey {Semnopithecus Entellus) , with d 12, I 7, the metapophysis 
exists, as an elongated tuberele, outside the anterior zygapophysis from the eleventh 
dorsal to the last lumbar: the anapophysis is present from the tenth dorsal to the 
sixth lumbar, it is long and styliform in the intermediate vertebreeo 
In the Macacus niger, with d and 7 I, the metapophysis is developed pretty 
clearly on the back part of the diapophysis of the tenth dorsal, and an anapophysis 
projects from its lower edge; on the eleventh these parts become still more distinct ; 
in the twelfth the metapophysis is situated upon the prozygapophysis, and the 
