52 MESSRS. MURIE AND MIVART ON THE 
interposed between corresponding digitations of the serratus magnus. It also arises 
from the lumbar fascia, beneath the latissimus dorsi and behind (below) that muscle, and 
from the anterior spine of the ilium. It is inserted into the aponeurosis of the abdomen, 
and is closely connected anteriorly (above), at its inner border, with the rectus. 
The fascia forms a wide, rather elongated abdominal ring, the inner pillar of which 
is much the stronger, and is inserted into the anterior margin of the pubis. The fibres 
composing the external pillar are more delicate, and interlace with those covering the 
cremaster, which muscle is much developed. 
In Galago crassicaudatus (PI. II. fig. 8, Pl. III. figs. 5 & 6, and PI. IV. fig. 9, Ex. 0). 
In Wycticebus tardigradus’ there is no variety in its attachments. 
Perodicticus’ has it springing from eight of the lower ribs. 
Tarsius* from the cartilages of all the ribs to the third uppermost. 
INTERNAL OBLIQUE.—Fleshy laterally, but aponeurotic for a wide space towards the 
middle line of the body. It arises from the outer half of the crural arch, from the 
spine of the ilium, and the lumbar fascia beneath the external oblique. The fibres 
ascend and are inserted into the aponeurosis of the abdomen and the cartilages of the 
four hindmost ribs. 
In Z. varius and in L. wanthomystax this is as in Z. catta, except that in the latter it 
is inserted into three only of the costal cartilages. 
In Galago crassicaudatus this muscle (PI. III. fig. 6, Jn.o) is only partially brought 
into view between the erector spine and external oblique, a portion of the latter muscle 
being removed. In G. allenii the internal oblique is pretty much intermixed with the 
transversalis, but corresponds tolerably well in its attachments to the above description 
of L. catta. 
According to Van Campen, in Perodicticus* this muscle is thinner than the external 
oblique, and its tendinous aponeurosis close to the fascia lata to form a distinct Poupart’s 
ligament. It is attached to the three hindmost ribs. 
It presents no peculiarities in Tarsius°. 
In Chetromys we find it muscular up to the margin of the rectus, and not aponeurotic 
as in Lemur catta. 
The TRANSVERSALIS is much more muscular than is the internal oblique. It arises 
from the spine of the ilium and from the fascia enclosing the erector spine, also from 
the inner surfaces of the hindmost four or five costal cartilages. 
This muscle continues fleshy much further towards the middle line of the abdomen 
than does the internal oblique; and a very wide space intervenes between its hinder 
(lower) border and the brim of the pelvis, as it takes no origin from the crural arch. 
In L. varius and L. vanthomystax it is scarcely more fleshy than is the internal 
oblique; that is to say, they are both so. 
1 P, Z. 8. 1865, p. 248. * Loe. cit. p. 28. 
* Op. cit. p. 45, tab. 3. fig. 1, no. 1. * Potto, p. 29. > Loc. cit. p. 45, tab. 4. fig. 2. no. iii. 
