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PETERSON : A REVISION. OF THE ENTELODONTIDZ: 
M&EASUREMENTS. 
Mm. 
Moetacanpalevssorentestilon pthc: vusyscccgr on aersedseen, ee accuse. to emnabe yim 40 
Wh (Oe TANS VOLEOL CL ATACLOT «aise veh tant ctiotov' sigd tute ms ates stein we Oremenoennemgent 25 
Phalanges. —The proximal and second phalanges are broad and depressed. 
The proximal phalanx has a shallow groove for the metapodial keel, confined to the 
plantar portion of the proximal articulation. Distally there is a smooth articular 
surface for the second phalanx, which is convex antero-posteriorly and concave 
transversely. The articulation is carried around upon the plantar surface of the 
bone, but does not extend very high up on the dorsal face. The plantar face has 
prominent rugosities for attachments not unlike what is seen in the recent camels. 
The second phalanx is even more suggestive of the camel though relatively much 
shorter and less depressed. It is unusually broad on the plantar face, but slopes 
tapidly dorsally. The proximal end has a smooth surface, which is deeply concave 
supero-inferiorly and gently convex laterally, to receive the correspondingly smooth 
surface of the distal end of the proximal phalanx. The distal trochlea is flexed ina 
much greater degree, especially dorsally, than that of the proximal phalanx. The 
bone is quite asymmetrical, having the internal border shorter than the external and 
also very rugose and heavy, while the external border shows no unusual characters. 
The ungual phalanges. of the fore foot are not present in the type, but fortu- 
nately they are represented in the fore foot of specimen No. 2186 (Carn. Mus. Cat. 
Vert. Foss.). This bone is unusually short and quite high. Anteriorly the ungual 
phalanx is much truncated and the bone asa whole has a curious nodular shape. The 
plantar surface is quite broad and convex in all directions except posteriorly. The 
sides slope rapidly to form a rounded and prominent dorsal ridge; this ridge termi- 
nates on the postero-dorsal angle in a broad, rather large and truncated tubercle 
for ligamentary attachments. Proximally there are two articulating facets for the 
phalanx of the second row, an external and an internal, and these are imperfectly 
divided by an oblique ridge. 
The phalanges of Hntelodon, which Kowalevsky figures (88, Pl. XX VII, fig. 38), 
are quite similar in shape to those in the American forms, except that the proximal 
phalanx according to this author is relatively longer in Entelodon. By comparative 
measurements it seems that the three® phalanges of a digit in Hnteledon are together 
perhaps longer than those in the American genera of this family ; in Sus the pha- 
langes are of a different shape, the proximal being thicker in proportion to its 
length, with a deeply grooved proximal trochlea for the keel of the distal end of the 
metapodial, while the ungual is longer, broader, and more pointed. In the Ameri- 
58'The ungual phalanx of Zntelodon is not known and is here only estimated. 
