30 SOLENODON PARADOXUS. 
of the condyle of the femur. It passes obliquely as a triangular muscle to insert 
upon the postero-ental surface of the tibia just proximal to the origin of the 
tibialis posticus. There is a large sesamoid in the tendon of origin, attached 
by fibers between the heads of tibia and fibula. 
The tibialis anticus (Plate 6, fig. 1, h) arises from the large shallow fossa 
on the ectal side of the tibia and the adjacent portion of the fibula. The muscle 
is triangular in section and becomes a strong flat tendon distally, that passes to 
the ental side of the foot through the same loop as the extensor longus digitorum. 
It is inserted on the ento-lateral side of the base of the entocuneiform bone, not on 
the rudimentary first metatarsal as in some mammals, e. g., the cat, or the meta- 
tarsal of the first digit as in Gymnura, Potamogale, and apparently Centetes. 
Dobson does not mention the connections of this muscle in Solenodon cubanus. 
In S. paradoxus, however, this termination was carefully verified on both hind 
feet. The inserting tendon is large and conspicuous and is inserted back from 
the anterior edge of the bone. 
The extensor longus digitorum pedis (Plate 6, fig. 1, g) is a very small nar- 
row muscle, hardly 2 mm. in radial thickness, and less than that in superficial 
breadth. Its origin is from the tendinous sheath covering the ectal aspect of 
the condyle of the femur. Its tendon passes through a loop on the anterior 
part of the ankle together with the tendon of the tibialis anticus, then 
through a second loop enclosing the extensor alone, which here has broken 
into four appressed thread-like branches, one to each of the digits, 2, 3, 4, and 
5. The branch to digit 5 is inserted at the ental, the others on the dorsal 
aspect of their respective digits. A similar arrangement is described for 
Gymnura and Centetes. 
The peroneus longus (Plate 6, fig. 1, /) is very distinctly from two heads. 
The first is from the tendinous sheath covering the external condyle of the 
femur, continuous with the origin of the extensor longus digitorum. These 
tendinous fibers pass across to the second and principal origin about the head of 
the fibula. At a little more than one half the length of the tibia the muscle 
passes into a slender tendon, which dips under a loop at the ectal side of the 
ankle, then under a second loop on a prominence at the ecto-anterior portion of 
the caleaneum. It then gives off a small branch to the base of metatarsal 5 
and continues across the foot to the insertion into the base of metatarsal 1. In _ 
Gymnura and Hrinaceus europaeus it is merely inserted into the internal cunei- 
form, but in E. jerdoni according to Dobson (’82-’90, p. 55) the branch to the 
fifth metatarsal is also present. The insertion into the first metatarsal seems 
