The Muscles 129 
flexor digitorum longus muscle. It divides into 
three bellies for the second, third and fourth toes. 
The first two are pierced by the above-mentioned 
tendon of the flexor digitorum longus and are in- 
serted on the next to last phalanx of the second and 
third toes; the third, on the contrary, is inserted 
on the claw joint of the fourth toe and is not per- 
forated; there is no tendon to the fourth toe from 
the flexor digitorum longus muscle. 
Extensor Hallucis Proprius (Plate V., Fig. 3) 
(Kurzer gemeinschaftlicher Zehenstrecker, Exten- 
sor hallucis). This muscle springs by a short, 
flat, fairly strong tendon from the outer dorsal 
border of the distal half of the fibula. It is in- 
serted: (1) on the proximal half of the first meta- 
tarsal bone, (2) a second much weaker part is 
united with the tendon of insertion of the tibialis 
anticus extensor longus digitorum to the first 
metatarsal bone. 
THE Tart MUSCLES 
The muscles of the tail have, as shown by 
Gadow, the character of the primitive body muscles, 
with their primitive metameric division, fairly 
plainly preserved. This musculature is arranged 
in four rows of trumpet-shaped cones, one project- 
ing into the other, by which arrangement each 
metamere exhibits a transverse zigzag line of four 
anteriorly and three posteriorly directed points. 
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