2900.] SHUFELDT—OSTEOLOGY OF THE STRIGES. 709 
facet, rises a little above that bone at the point where it is attached 
toit by ligament. This is the larger part of the shaft in regard to 
size. Below the ridge this bone becomes simply a delicate little 
spine, that merges into the shaft of the tibia at about the junction 
of middle and distal thirds, though it may be traced after this as 
far as the middle of the outer condyle, where it terminates by a 
minute tubercle. The head is notched externally, near the centre, 
and has lodged at that point a small sesamoid that is in the lateral 
ligament of the knee-joint. Posteriorly on the shaft, about midway 
down the superior tibio-fibular articulation, we observe a small 
tubercle for the insertion of the tendon of the biceps. The long 
segment that exists between the tibia and the phalanges of the 
pelvic limb is the bone tarso-metatarsus, or the confluent metatar- 
sals of the second, third and fourth toes with certain tarsal bones 
at its proximal extremity. It measures down the anterior aspect, 
mesially, 4.6 centimetres, and has its extremities enlarged for 
articular purposes, in common with other long bones of the 
skeleton. At its proximal end the bone presents superiorly two 
concave articular surfaces for the condyles of the tibia. They 
appear nearly on a level with each other, the bone being held verti- 
cally. The inner and larger of the two is elliptical in outline, 
antero-posteriorly ; the outer and smaller is fashioned off behind 
by a tuberous process, directed upward and outward. Between 
these two surfaces arises a prominent tuberosity that in the 
articulated limb enters the intercondyloid notch of the tibia quite 
accurately, and is intended for ligamentous attachment. Anteriorly 
and internally a groove exists that runs down the shaft, to disap- 
pear a little above its middle. This canal is deepest immediately 
below the articular expansion, and is here bridged over by a little 
arch of bone, a millimetre in width, that serves to bind down and 
hold in its proper place the tendon of the long extensor of the toes. 
Posteriorly there is a much deeper and longer tendinal canal that 
extends the entire length of the shaft, being shallowest at the 
middle and thost capacious at the proximal extremity; this is 
bounded above and internally for a short distance below the head 
of the bone by the hypotarsus, a thin lamina of bone that has a 
foramen near its base ; this process is surmounted by an elliptical 
and compressed tuberosity, placed vertically. Above, the opposite 
wall of this groove is also thin, and extends in common with the 
calcaneal process, directed backward. There are two other foramina 
