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PROFESSOR OWEN ON THE MEGATHERIUM. 
the fourteenth these processes are distinct and well-developed, but the diapophysis 
has disappeared ; it reappears, however, in the lumbar vertebrae, from the first and 
second of which, nevertheless, the anapophysis continues to be developed ; but this 
subsides in the last. 
In the Capuchin [Cehus capucinus), with d 13, / 6, in the fifth dorsal the tubercles 
representing the met- and an-apophyses project distinctly, the one from the fore- 
part, the other from the back part of the diapophysis : they progressively increase in 
size and distinctness, and in the thirteenth dorsal the metapophysis has risen upon 
the anterior zygapophysis. The anapophysis continues to be developed to the penul- 
timate lumbar vertebra. 
In the Marmoset {CalUthrix sciureus), with d 13, Z 7? the tubercle above the diapo- 
physis divides into a met- and an-apophysis in the ninth dorsal; in the tenth these 
processes diverge, and in the eleventh become quite distinct ; they continue to increase 
in length to the fifth lumbar ; the anapophysis then diminishing, and being suppressed 
in the last lumbar. 
In the Black-fronted Lemur {Lemur nigrifrons), with d 12, 17 , the metapophysis 
begins to be developed in the middle dorsal vertebrae, and in the tenth projects from 
above the diapophysis : this disappears in the eleventh dorsal, and the metapophysis 
is on the outside of the anterior zygapophysis. From this vertebra a well-marked 
anapophysis is developed, and is continued from all the succeeding vertebrae. The 
diapophysis reappears upon the first lumbar, and increases in length and breadth as 
these approach the sacrum. 
In a Ring-tailed Lemur {Lemur Catta), with d 13 and and in a Ruffed Lemur 
{Lemur Macauco), with dl2, Ij, the division of the ‘transverse process’ into 
di-, met- and an-apophyses is well shown in the tenth dorsal, and in the succeeding 
vertebrae the three processes are distinct and remote. 
In the Indri {Lichanotus Indri), with d 12, 1 9, the diapophyses of the dorsals sup- 
port a metapophysial tubercle, which grows as the diapophyses diminish, and seems 
to take their place in the eleventh and twelfth dorsals : in the twelfth the metapo- 
physis rises from above the prozygapophysis and is continued backwards upon a 
well-developed anapophysis which commences at once in that vertebra, and con- 
tinues to be developed though decreasing in length to the penultimate lumbar in- 
clusive. The metapophyses, which are prominent in the anterior lumbar vertebrae, 
gradually subside as they approach the sacrum. The diapophysis has a low rough 
tubercle in the first lumbar vertebra, which is developed into a depressed plate, in- 
creasing in length and breadth as it approaches the sacrum. 
In the Slow Lemur {Stenops gracilis), with d 14, / 9, a metapophysial tubercle is 
developed from above the diapophysis from the first to the twelfth dorsal vertebra ; 
in the thirteenth it takes the place of the diapophysis, and in the fourteenth it extends 
forwards and presents an articular surface to a facet on the outer side of the post- 
zygapophysis of the thirteenth vertebra. The metapophysis has the same disposition 
