ANCODON GOREINGEI. 
187 
which beneath this point becomes much more slender, expanding again a little towards 
the distal articulation. The distal articulation is quadrate in outline, and its outer border 
is occupied by a large I'acet for the fibula, looking outwards and downwards. The 
groove for the outer half of the astragalar articulation is both broader and shallower 
than the inner, which is very narrow and is deepened anteriorly by the presence of a 
strong internal malleolar ])rocess. The dimensions (in centimetres) of this S})ecimen 
are : — 
Extreme length 40'5 
Width of proximal end 10 
„ distal end 6-2 
Antero-posterior length of distal articulation 4-2 
Width of shaft at narrowest 3‘8 
Presented hy the Egyptian Government, 1904. 
C. 8899. A similar right tibia, of which the dimensions (in centimetres) are : — 
Extreme length 39 
AVidth of proximal end 10 
„ distal end 5'4 
,, shaft at narrowest 3’7 
C. 9312. Eight tibia of rather more slender form, probably of a different species. A very 
prominent thin internal malleolus. The dimensions (in centimeti'es) are : — 
Extreme length 41 
AVidth of proximal end 9 
„ distal end 4'6 
„ shaft at narrowest 3‘4 
M. 8864b. Right tibia, similar to M. 8864 a, but wanting the proximal epiphysis. 
Presented hy the Egyptian Government, 1904. 
M. 8507. Right astragalus (text-fig. 61). In this bone the relative heights of the outer {ox.) and 
inner condyles {ix.) of the proximal trochlea are about as in astragali of Ancodon 
(dlyopotamns) from the Isle of AVight, but the outer condyle is rather more massive. 
In the distal trochlea the cuboid surface {cvb.) is I’elatively rather wider, and the keel 
between it and the navicular surface (nav.) less prominent than in the European species. 
The sustentacular articulation {sus., sus.') seems to be closely similar to that described by 
Scott * in the American species — that is to say, it is divided into an outer facet (sus.), 
nearly flat from side to side, but convex from before backwards and looking towards 
the plantar surface, and an inner (sus.'), in this case much narrower, facet, which 
does not extend quite so high up proximally, but further distally, the distal portion 
being an almost distinct rounded surface ; this internal portion of the sustentacular 
articulation looks towards the outer and plantar surface. Of the outer calcaneal facets 
the proximal one (ect.) is divided by a deep depression into proximal and distal portions, 
of which the latter is borne on a strong prominence and looks mainly towards the 
* u 
The Structure and Relationships of Ancodus,” Journ. Acad. Nat. Sci. Philad. [2] vol. ix. pp. 482-83. 
