286 Rev. S. Haughton on the Muscular 
31. Soleus. None. 
32. Flexor digitorum longus. 0°80 0z. QO. usual. I. into 
the ungual phalanges of the first, second, and third toes only. 
33. Flexor hallucis longus. 0-20 0z. O. from the back of 
the outer condyle of the femur, from the tendon of the extensor 
femoris caudalis. I. into the tendon of the flexor digitorum 
longus. 
34. Tibialis posticus. 0°72 0z. This muscle is inserted 
into the near ends of the first and second metatarsal bones. 
35. Flexor digitorum brevis. 0°76 oz. Consists of three 
distinct muscles, distributed to the second, third, and fourth 
toes: a, flexor 24 digiti perforatus, 0°45 oz.; 3, Hexor 3H di- 
giti perforatus, 0°20 oz.; c, flexor 4% digiti perforans, 0°11 oz. 
The flexors a and b are perforate flexors, and are distributed 
to the penultimate phalanges, while flexor c is carried on to 
the ungual phalanx, and supplies the office of the flexor longus, 
which is wanting in the fourth toe. The flexor brevis of the 
second toe (a) takes its origin partly from the caleaneum and 
partly from the tendon of the plantaris. 
36. Flexori longo accessorius. 0°34 0z. QO. from the eal- 
caneum and cuboid bones. I. into the back of the common 
tendon of the flexor digitorum longus, which is distributed to 
the first, second, and third toes only. 
37. Tibialis anticus. 
38. Extensor hallucis. 1°22 oz. 
39. Extensor digitorum longus. 
QO. from the tibia and fibula, and by means of a long tendon 
from the anterior surface of the outer condyle, inside the knee- 
joint. ; 
40. Peroneus tertius. 0°15 0z. The tendon of this muscle 
crosses the back of the foot to be inserted into the metatarsal 
of the first toe. 
41. Peroneus brevis. 0°17 0z. Inserted into the outer 
side of the outer tarsal bone (cuboid and rudimentary fifth 
metatarsal), 
42. Peroneus longus. 0°40 oz. Takes its origin from the 
fibula, and is closely associated with the outer gastrocnemius. 
43. Extensor femoris caudalis. 14°550z. This important 
muscle is similar to that found in the Crocodile (¢bid. p. 328), 
and derives its origin from the under surfaces of the transverse 
processes, and from the sides of the inferior spinous processes 
(chevron bones or hemal processes) of the caudal vertebrae, 
from the first to the fifteenth. 
N.B. The first chevron bone begins at the junction of the 
second and third caudal vertebre. 
44, Marsupialis externus. 1°05 oz. 
