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DR. J. MURIE ON THE ANATOMY OF THE SEA-LION. 
the penultimate last lumbar and first sacral vertebra, and from the transverse processes 
of the former with fibres also from the ilium. The belly of the muscle is slightly 
suleated or divided into three slips, the external cutaneous nerve passing between the 
middle and outer slip. The iliacus is inserted by a small, short and strong tendon into 
the inner trochanter. 
Quadratus lumborum.—As in some of the Carnivora, as well as in the Lemuroidea, 
this muscle is composed of many fleshy and tendinous slips. ‘There are six or seven of 
these muscular slips (@./), arising from the bodies of the last three dorsal, and more or 
less from the whole of the lumbar vertebra. ‘These slips give off five long tendons, four 
of which are inserted into the tips of the transverse processes of the lumbar vertebree, 
and a posterior one into the rim of the ilium. In the thorax the first two bellies unite 
and form one tendon, which goes to the first lumbar transverse process, ‘The next two 
slips give off atendon apiece. The fifth and sixth bellies together supply another tendon, 
while the last broad part is single. 
The conjoined pubo- and ilio-coccyyeus (P.&Ic, tig. 36) cover, as a thin musculo- 
tendinous elongated fan-shaped layer, the inner surface of the pelvis, from the ischial 
end of the obturatory foramen to a short distance behind its opposite extremity. The 
muscle thus lies compressed between the internal obturator muscle and the great 
ischiatic ligament on the one (outer) side and the sacro-coccygeus and caudal vertebrie 
on the other (inner) side. The musculo-tendinous belly continues thickish as it passes 
backwards, and is attached to the transverse processes of the last two sacral elements 
and as many caudal vertebre. A fleshy part of the muscle, ending in a strong flattened 
tendon, moreover slants inwards and across the sacro-coccygeal tendons, to be inserted on 
the inferior surface and median line of the body of the caudal vertebra. 
Sacro-coccygeus.—N otwithstanding the shortness of the tail, this muscle and its 
tendons are well developed. A long compressed muscular bundle, with a considerable 
amount of strong glistening aponeurosis outside it, stretches upon the sides and fronts 
of the sacral and caudal vertebrae from the sacro-iliac synchondrosis to opposite the 
tuberosity of the ischium, where the outer sheath appears to separate into a number 
of tendons, sent on to the tail. Four of these tendons, the uppermost broadest and 
strongest, the others decreasing in size, go to be implanted on the sides of the caudal 
vertebre. Four more, finer tendons come off from the inner and fleshy side of the 
muscle, and are inserted on the middle and under surface of the terminal vertebre 
behind the transyerse levator ani, the fleshy fibres of these running lower and lower 
from without inwards, the hindermost springing from the caudal elements opposite 
the levator caude. The whole of the tendons spoken of penetrate the pubo-coccygeus, 
or, rather, pass under the lower median tendon of insertion. 
The infracoccygeus, both in muscle (belly) and tendon, is with difficulty separated 
from the sacro-coccygeus, the whole being more or less invested with dense fascia, 
which, especially towards the extremity of the tail, enwraps and binds firmly together 
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