40 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
and postfrontal converge to a tendinous insertion on the coronoid — 
bone of the lower jaw. There is also a tendinous fascia at the dorsal — 
end of the quadrate, which extends forward on to the parietal. In 
large part the fibers have a fleshy insertion along the complementare, 
The innervation (Plate 8, fig. 6, cap. md.! and cap. md.?) is from several - 
motor rami which leave ramus mandibularis V just distal to the 
Gasserian ganglion. . 
M. pterygoideus (internal pterygoid). It is difficult clearly to 
delimit this muscle from the foregoing, as that part of its origin on the 
parietal is simply a continuation of the area of origin of m. capiti 
mandibularis; the part of it originating along the epipterygoid (Plate 
6, fig. 16, pt.'), known as the “deeper portion,” forms a mass of fibers 
more vertical in direction and innervated by a branch of the ramus 
which also innervates the m. pterygo-mandibularis: The portion 
described by Bradley as the “superficial” part (Plates 5, 6, figs. 
14-16, pt.) originates from the parietal and upper end of the columella, 
its fibers converging to a tendinous insertion on the coronoideum 
mesad to that of m. capiti mandibularis. With the pterygo-man- 
dibularis removed, the deeper part of the pterygoideus is well 
demonstrated from the ventral aspect, where it appears as a flat 
band extending from nearly the whole length of the epipterygoid to 
be inserted mesad to the superficial part. 
M. sphincter colli (spht. coll., Fig. F). This is not a well developed 
muscle in Anolis and is very easily torn off with the skin. Its fibers 
are so little massed that the innervation is very difficult to determine, 
except by means of the dissection of preparations blackened in osmic 
acid. The fibers have their origin superficial to the digastric, they 
cover this muscle to some extent and, forming an extremely thin band, 
pass as a continuous bundle to the opposite side. The distinctness 
of this muscle is emphasized in the figure. In the median ventral 
region its fibers pass dorsal to cerato-branchials I, where they are | 
interrupted by fascia, and some of them dip under the fibers of the 
ventral longitudinal muscles so that it becomes impossible to dissect _ 
the sphincter colli free along the ventral median line. Its innervation _ 
(Fig. J) is from a very fine bundle of the ventral division of motor VII. | 
In Anolis this muscle does not take any part in bounding the external | 
auditory meatus, nor does it form a “Schliessmuskel,” as described 
by Versluys (’98) for some of the Geckoniden. 
M. mylo-hyoideus (intermandibularis). This muscle (Fig. F, myl-hy-) 
is also very thin and similar to the sphincter colli, although not s0 | 
attenuated as the latter. It forms a sheet of muscle extending from 
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