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inch and a half: its obtuse and thick upper end commences behind and half an inch 
below the posterior border of the entocondyloid cavity: the process gradually contracts 
to a point at its lower end, which overhangs the smooth groove continued obliquely 
downwards and outwards to the foramen formed by the persistent remnant of the inter- 
osseous space between the inner (11) and middle (111) metatarsal elements of the com- 
pound metatarse. 
The mesocalcaneal process (fig. 2, cm) is the largest of the three: it is broad and 
rounded about, slightly grooved down its posterior surface, and supported by the rough 
posteriorly projecting buttress-like part of the mesometatarse, of which it seems to form 
the obtuse summit. 
The ectocalcaneal process is the smallest: it is separated by a shallow open groove 
from the mesocalcaneal process: it begins to project half an inch below the posterior 
convexity of the ectocondyloid surface: its lower part subsides before it reaches the 
foramen between the ecto- and meso-metatarse. The interval between the two inter- 
osseous foramina, which gives the breadth of the mesometatarse at that point, is greater 
in the Palapteryx robustus than in the Dinorms giganteus, notwithstanding the greater 
length of the bone in the latter species. 
The anterior intercondyloid protuberance sends a short obtuse ridge downwards and 
slightly outwards upon the fore part of the upper end of the tarso-metatarse. A large 
low rough protuberance projects forwards and outwards below the antero-internal angle 
of the entocondyloid surface; between this protuberance and the opposite angle the 
anterior surface is gently concave from side to side : the fossa between the proximal ends 
of the ento- and ecto-metatarsals commences two inches below the intercondyloid 
eminence: it is a vertical elongated ellipse, bounded behind by the mesometatarse, and 
below by the rough depression and protuberance, for the insertion of the Tibialis anticus. 
Below this protuberance a broad and very shallow depression extends to near the middle 
of the shaft, where it is filled up by the advance of the mesometatarse towards the 
anterior surface of the bone, where it forms a longitudinal prominence, which increases in 
breadth as it approaches the condyle of the same element: a shallow and longitudinal 
groove extends on each side of this median eminence to the interspaces between the 
middle and the lateral condyles. There is no perforation in either of the grooves leading 
to these interspaces. 
The back part of the upper two-thirds of the shaft of the mesometatarse forms a 
buttress-like prominence extending from the mesocalcaneal process down to the lower 
third of the common shaft; the upper third of this process is very ragged; the rest is 
comparatively smooth: the borders of the back part of the common shaft are roughened 
for the attachment of the strong fascia that bound down the tendons traversing that 
aspect of the shaft: the rough tract on the inner side terminates in the rough oval 
depression for the attachment of the rudimental metatarse of the hallux: from the lower 
border of this depression to the division between the inner and middle condyle measures 
