32 
short ridge (f'), in some specimens, joins the third to form the entogastrocnemial 
ridge. The fore part of the entocondylar expansion shows two or three oblong 
tuberosities, in the same transyerse line, the outermost of which (fig. 8, h) extends 
down asa short ridge and forms part of the inner boundary of the “ anterior interosseous 
depression (2). 
This, which is due to the retrogression of the head of the mesometatarsal (11), is 
bounded above by the part of the confluent epiphysis developing the intercondylar 
tuberosity (¢); its sides are formed by the more advanced proximal ends of the ento- (11) 
and ecto- (Iv) metatarsals, the latter bone defining that side of the fossa by a ridge or 
ridge-like angle continued into the “ ectometatarsal ridge” (4), which descends inclining 
to the outer side of the lower part of the ectometatarsal (1v). Into the antinterosseal 
depression (i) open the two fore-and-aft canals between the upper ends of the meta- 
tarsals, that (7) between the ento- and meso-metatarsal being the largest; it is vertically 
elliptical, 34 lines by 24 lines in diameter, The canal between the meso- and ecto- 
metatarsals opens into the fossa by a vertical slit (fig. 3, m), two lines long and two thirds 
of aline wide. Below the larger foramen is a rough surface (7) for the insertion of 
the “tibialis anticus;” it does not project. The interosseous depression (7) gradually 
shallows and contracts as it descends, or as the middle metatarsal advances into line 
with the outer and inner ones, the boundaries being defined by low narrow antinter- 
osseal ridges, which, midway down the shaft, diverge as they descend, the outer one 
(fig 3,0) terminating in the groove leading to the lower interosseal canal (p) between 
the meso- (111) and ecto- (Iv) metatarsals. ‘The anterior orifice of this canal (fig. 3, p) 
is vertically oblong, about 14 of a line in width; the posterior orifice (fig. 2, p’) is 
minute and circular. ‘The bar or bridge of bone (ib, ¢), from the neck of the ecto- 
trochlea (Iv) to that of the mesotrochlea (1m), converts the remaining interspace behind 
into a vertical “adductor” canal, leading from the anterior orifice of the lower inter- 
osseal canal (p) to the interval between the ecto- and meso-trochlee. The tendon of 
the “adductor digiti externi” traverses this canal, to be inserted into the inner side of 
the base of the proximal phalanx of the outer toe. 
The calcaneal process (7, s) is developed from the back part of the head of the meso- 
metatarsal (111) and the part of the proximal epiphysis confluent therewith; it is divided 
into ento- (7) and ecto- (s) caleaneal portions, by the tendinal canal (¢) completed by 
peripheral ossification between those portions; this uniting plate of bone is impressed 
externally by an open shallow tendinal groove (u). The outer part of the ectocaleaneal 
process is impressed by a narrower and deeper tendinal groove. The posterior rough 
and flattened surface of the entocalcaneal process is elongate and contracted below; in 
Pezophaps minor (PI, IIT. fig. 6, r), where alone I have seen it entire, it is 10 lines long 
by 34 lines in extreme width. The ectocalcaneal process (ib. s) shows a similar surface, 
7 lines in length and 2 lines in breadth, in Pez. minor. A deep and wide elongate 
channel (fig. 4, v) intervenes between the entogastrocnemial ridge (7) and the calcaneal 
