853 MR. ST. GEORGE MIVART ON THE [ Dee. 6, 
portion of the lower part of the longissimus dorsi. Diverging 
outward it is implanted into the postero-internal aspect of the 
suspensorium, and into the back of the skull. At its insertion this 
muscle has the postero-superior part of the temporal at its inner 
side, and the upper part of the depressor mandibule at its outer side. 
It is also implanted above and internal to the attachment of the 
sterno-mastoid. 
Sacro-lumbalis (fig. 2, S). This muscle arises from the dense 
fibrous tissue in which the ilium is more or less imbedded. Thence 
its fibres pass forward, being conterminous below with the origin of 
the external oblique, and conterminous above with the inferior 
margin of the lower part of the longissimus dorsi. Anteriorly this 
muscle becomes very indistinct, being with difficulty separable from 
the similarly directed fibres of the external intercostals. Passing 
forward beneath the latissimus dorsi, the trapezius, and the levator 
clavicule, it ends by constituting the muscle next described. 
Cervicalis ascendens (fig. 7, C. A). This is the continuation for- 
ward of the sacro-lumbalis. It is connected with the ribs and 
transverse processes of the more anterior vertebrze, and is inserted 
into the atlas. 
Scalenus (figs. 5 and 7, Sc.). This lies immediately on the 
ventral side of the cervicalis ascendens. It arises from the side of 
the atlas, and, passing backward between the complexus minor and 
rectus anticus, is inserted into the first rib which is elongated but 
does not reach the sternum. 
The sterno-mastoid * (fig. 5, S. M, and figs. 6 and 7, St. JZ) is 
short, and is directed strongly upward as well as forward. It arises 
from the antero-external part of the coracoid groove of the sternum, 
and is inserted into the postero-internal aspect of the suspensorium. 
It is in close proximity to the sterno-thyroid; but the narrow omo- 
hyoid passes between. 
External oblique + (figs. 1, 4,5, 6, and 7, £. O). This muscle is 
not largely developed. It arises by delicate fascia from the outside 
of the ribs (beginning with the first elongated one), at the line of 
fascia which bounds infero-externally the sacro-lumbalis. Anteriorly 
the origin of the muscle is less than half an inch above the angles of 
the ribs; posteriorly it is more than half an inch above them. 
The muscular fibres do not nearly reach the inferior middle line of 
the body, but end in a delicate aponeurosis. Posteriorly this 
muscle ends in a well-marked border (concave backwards), thus 
allowing the tendon of origin of the internal oblique to come into 
view behind and within it. The converging fibres in part unite with 
the rectus, and in part are inserted into the fascia binding down the 
muscles of the thigh. Anteriorly the external oblique is overlapped 
by the latissimus dorsi above, and is somewhat blended with the 
pectoralis below. 
* Meckel, 7. c. p. 282. 
t+ Meckel (7. c. p. 287) says the abdominal muscles of the Chameleon are ex- 
ceptionally feeble and simple. ‘They are so; but in C. parsonii they are more 
developed (relatively as well as absolutely) than in the common Chameleon. 
