1869.) THE MYOLOGY OF MENOPOMA. 271 
The biceps (?) (figs. 9 & 10, B) is slender, like the muscle last 
described ; it extends from the insertion of the femoro-caudal to the 
fibula, being fixed to that bone immediately below the attachment of 
the ilio-peroneal. It expands somewhat just before its insertion. 
Tibialis anticus (figs. 7, 8,9, 10, & 11, T. A). This is a large 
and prominent muscle. It arises from the front of the distal end ot 
the femur and from the proximal parts of the tibia and fibula. It 
is inserted into the tarsus on its tibial side. 
Peroneus. A portion of muscle, somewhat difficult to define ex- 
actly, passes down, in front of the insertions of the ilio-peroneal and 
biceps, from the head of the fibula to the peroneal side of the tarsus. 
Extensor longus digitorum (figs. 8 & 9, BE. L. D). This large 
muscular layer arises, by a strong aponeurosis, from the front of the 
distal end of the femur. Passing downwards it goes to the digits. 
Extensor hallucis (?) (fig. 9, E. H). A rather delicate muscle, 
covered by that last described. It goes from the upper part of the 
fibula downwards to the hallux. ; 
Extensor brevis digitorum (fig. 9, E. B). A small triangular 
muscle, placed on the peroneal side of that last described, passes 
down obliquely from the lower end of the fibula to the four peroneal 
digits. 
Flexor digitorum (figs. 10 & 11, F. D). This considerable muscle 
comes into view when the expanded lower part of the semitendinosus 
is removed. It arises from the posterior surface of the peroneal 
condyle of the femur, and passes downwards to the pedal digits. 
Deepest muscles of ventral or flexor surface of right pelvic limb, the semiten- 
dinosus and flexor digitorum being cut and reflected. 
A, Adductor. F.D. Flexor digitorum. F. H. Flexor hallucis. G. Gracilis. 
S. T. Semitendinosus. 7! A. Tibialis anticus. 
Flexor hallucis (?) (fig. 11, F. H). Onthe removal or reflection of 
the flexor digitorum, a deeper layer of muscle, subtriangular in shape, 
comes into view. It arises from the whole length of the fibula, and 
passes obliquely downwards to the sole of the foot. It goes mainly, 
if not exclusively, to the hallux. 
Peroneo-tibial (?). Some muscular fibres connect the lower part 
of the tibia and fibula, passing obliquely from the latter bone down- 
wards and inwards to the former. 
