
1870. | MYOLOGY OF CUAMALEON PARSONII. 861 
External intercostals, These muscles seem to be formed by the 
internal oblique, from which they are undistinguishable. 
The internal intercostals are formed, as above said, by the trans- 
versalis. 
Rectus * (figs. 3 and 4, R). This muscle is interrupted by the 
ventral ribs, which its several portions connect together. Considered 
as one whole, it springs from the pubic symphysis, and is inserted 
anteriorly into the posterior margin of the sternum, its anterior end 
being enclosed between the posterior origins of the two sterno- 
hyoids. 
The parts between the ventral ribs are with difficulty separable 
from the internal oblique, so that they might be regarded as thick- 
ened fasciculi of the mid-ventral portion of that muscle. 
The rectus anticus (fig. 5, R. A) is the only subvertebral 
muscle, there being no retrahentes costarum. It springs from the 
ventral aspect of the bodies of about the first 8 or 9 vertebre, 
and it is inserted into the side of the occipital part of the basis 
eranil. 
Supracostalis (figs. 6 and 7, P. C). This is a fleshy band which 
passes upward and forward from the third sternal rib to the first 
elongated rib, which is in front of the first sternal rib. At its in- 
sertion it is conterminous with the most ventral part of the origin of 
the serratus magnus. 
The sterno-hyoid and sterno-thyroid have been noticed amongst 
the muscles of the hyoid. 
The pectoralis, latissimus dorsi, and sterno-coracoid will be de- 
scribed amongst the appendicular muscles. 
IV. Muscues or THe Tatu. 
Supracaudal. The muscles which occupy the upper half of 
the caudal surface are the direct continuations backward of the 
longissimus dorsi. The continuation is direct, because the ilium 
does not divide them, but is superficial to them. 
The upper part (figs. 2 and 27, A) occupies the greove between 
the spines and zygapophyses, like the upper part of the longissimus 
dorsi. 
The lower part (figs. 2 and 27, B) occupies the groove between 
the zygapophyses and the transverse processes, like the lower part of 
the longissimus dorsi. These muscles are continued to the end of 
the tail. 
The ilio-caudal (figs. 2 and 27, I/. C) seems to more or less 
continue backward the sacro-lumbalis, though it is not uninterrupt- 
edly connected with it, but springs from the sacro-iliac attachment 
and the hinder side of the sacral transverse process. It runs 
backward above, below, and between the caudal transverse processes, 
and is indistinctly subdivisible into two or more longitudinal muscles, 
It seems to answer to the ilio-caudal of the Uredelat. It runs 
* Meckel, /. c. p. 287. 
+ See P. Z. S. 1869, pp. 268 and 463. 
