35 
trochanter, into the inner side of the femur near the head of that 
bone, which it thus adducts and rotates outwards. This muscle is 
present both in the Ostrich and Bustard, but Meckel says it is want- 
ing in the Cassowary.—Arch. xiii. 261. 
Pyramidalis.—The same kind of modification which affects the 
iliacus internus, viz. the displacement of its origin from the inner 
surface of the ilium to a situation nearly external, affects this muscle, 
which, from its insertion and triangular form, I regard as the ana- 
logue of the pyramidalis. It arises fleshy from the outer surface of 
the extended ischium for the extent of an inch, and converges to a 
broad flat tendon which is inserted into the trochanter femoris oppo- 
site, but close to, that of the gluteus minimus, which it opposes, ab- 
ducting and rotating the femur outwards. 
Adductor brevis femoris.—A small, long and slender muscle arises 
from the innominatum immediately behind the acetabulum, passes 
over the back part of the great trochanter, becomes partially tendi- 
nous, and is inserted into the back part of the femur in common with 
the following muscle. 
Adductor longus. —A long broad and thin muscle, separated from 
the preceding by the ischiadic nerve and artery. The origin of this 
muscle extends one inch and a quarter from near the upper margin 
of the innominatum which is behind the acetabulum ; it is joined by 
the preceding strip, and is inserted into the whole of the lower two- 
thirds of the back part of the femur. 
Adductor magnus.—This broad and flat muscle has an extensive 
origin (two inches) from the outer edge of the ischium and the 
obturator fascia ; its fibres slightly diverge as they pass downwards 
to be inserted into the back part of the lower half of the femur, and 
into the upper and back part of the tibia. 
Obturator internus.—This arises from the inner side of the oppo- 
site margins of the pubis and ischium, where they form the posterior 
boundary of the obturator foramen, and from the corresponding part 
of the obturator fascia; the fleshy fibres converge in a slightly pen- 
niform manner to the strong round tendon which glides through the 
notch, separated from the rest of the foramen by a short, strong, 
transverse, unossified ligament, and is inserted into the posterior part 
of the base of the trochanter. In its length and size this muscle re- 
sembles the corresponding one in the Ostrich and other Struthious 
birds. 
Gemellus.—This is represented by a single small fleshy strip 
arising from the margin of the obturator foramen, close to the emer- 
gence of the tendon of the obturator internus, with which it is joined, 
and co-inserted into the femur. 
Quadratus.—I consider a broad fleshy muscle which arises from 
the pubis, below the obturator foramen, and which increases in breadth 
to be inserted into the femur internal and posterior to the obturator 
tendon, to be the true analogue of the guadratus femoris. 
Mouscuzs or THE Lee. 
Tensor vagine and Rectus femoris.—The largest and most remark- 
