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twenty-two dorso-lumbar vertebrae in the Rhinoceros, twenty-three 
in the Tapir and Paleotherium, and as many as twenty-nine in the 
little Hyrax. 
With regard to the vertebre of the trunk of the Aurochs, I may 
remark, that the only accessory process in addition to the ordinary 
zygapophyses and diapophyses is the metapophysis, which appears 
as a stout tubercle above the diapophysis in the middle dorsals, and 
gradually advances and rises upon the anterior zygapophyses in the 
posterior dorsal and lumbar vertebre. This process is developed to 
an equality of length with the spinous processes in the Armadillos. 
It is commonly associated with another accessory exogenous process, 
to which I have given the name ‘ anapophysis’ in the Catalogue of 
the Osteological Series in the Royal College of Surgeons. This 
process, which in most of the Rodentia rises, at first, im common 
with the metapophysis, as a tubercle above the diapophysis, separates 
from the metapophysis as the vertebra approach the pelvis, and in 
the lumbar series the anapophysis is seen projecting backwards from’ 
the base, or a little above the base of the diapophysis, its office being 
usually that of underlapping the anterior zygapophysis of the suc- 
ceeding vertebre, and strengthening the articulation, whence Cuvier 
has alluded to it as an accessory articular process; but its relation 
to the zygapophysial joint is an occasional and not a constant cha- 
racter. The tenth dorsal vertebra of the Saw-toothed Seal, Steno- 
rhynchus serridens, affords a good example of well-developed metapo- 
physes; they are also large in most of the trunk vertebre of the 
Tapir. The anapophyses are well-developed in the anterior lumbar 
vertebre of the Hare and Rabbit. 
I have been induced to make this digression at the request of some 
of my anatomical friends, who have desired me to publish definitions 
of the terms, or rather of the processes so termed. 
Returning to the Aurochs, I shall conclude with some remarks, 
which the opportunity of dissecting the recent animal enables me to 
offer, respecting the true structure of the bones of the fore-foot (fig. 1) 
and hind-foot (fig. 2). 
The carpus (fig. 1) consists, as in other Ruminants, of six bones, 
four in the proximal row, viz. scaphoides (s), lunare (/), cuneiforme 
(c), pisiforme (p); and two in the second row, the magnum (m) and 
the unciforme (w). 
The os magnum supports that half of the cannon-bone which 
answers to the metacarpal of the digitus medius (111). The unci- 
forme supports the other moiety which answers to the metacarpus 
of the digitus annularis (1v). The rudiment of the proximal end of 
the metacarpus of the digitus index ( 11) articulates with a part of the 
os magnum, which may therefore be regarded as a connate trape- 
zoides. The rudiment of the proximal end of the metacarpal of the 
digitus minimus (v) articulates with the cuneiforme, and is applied 
to the ulnar end of the unciforme. 
The distal rudiments of the two abortive digits (11) and (v) are re- 
presented by a middle phalanx (2) and ungual phalanx (3), supported 
by fascize extending from the proximal rudiments of their metacarpals, 
