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 fonvard on to the parietal. In 

 large part the fibers have a fleshy insertion along the complementare. 

 The innervation (Plate 3, 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- 

 dil^ularis 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 de\'eloped 

 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 II, 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 Yll. 



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 (intermandilmlaris). This muscle (Fig. F, myl-hy.) 

 is also very thin and similar to the sphincter colli, although not so 

 attenuated as the latter. It forms a sheet of muscle extending from 



