54 THE SALAMANDER 



pre-articular. The skin at the corner of the mouth is strongly 

 reflexed dorsalwards and is firmly bound to the anterior portion of 

 this muscle — in fact some of the fibres seem actually to be inserted 

 on it. Like that of the previous muscle the insertion is fleshy 

 posteriorly with a tendency to become tendinous anteriorly. 



Innervation : By fine twigs from the mandibular nerve (V3). 



Function: To assist in closing the mouth. The M. levator mandi- 

 bulae in general is opposed by the M. depressor mandibulae, a 

 muscle supplied by the Vllth nerve. 



M. intermandihularis (Edgeworth) (PI. VI, fig. 37). 



Mylohyoideus . v.Siebold (1828); Carus(i828)j Stannius (1854); 



Owen (1866); Coghill (190 1-6). 

 „ (et interhyoideus) .... Walter (1887). 



„ (et interhyoideus et interhyoideus 



posterior) ..... Funk (1827). 



As its name implies this is a sheet of muscular tissue stretching 

 across the floor of the mouth between the rami of the lower jaw. It 

 lies immediately under the skin. In the larva it consists of two dis- 

 tinct parts, a small anterior portion lying in the angle of the chin, 

 and a larger posterior portion. It is the latter only which is found in 

 the adult after metamorphosis, but the synonyms of the anterior 

 portion are given below for the sake of completeness. 



M. intermandihularis anterior. Driiner (1901); Luther (19 14); 

 Edgeworth (1920 et seq.). 



Submentalis . . Fischer (1843); Mivart (1869); Osawa (1902). 



Genio-glossus . Schmidt, Goddard and van d. Hoeven (1864). 



Submaxillaris ...... Hoffmann (1873-8). 



Camv (antr.) Ruge (1897). 



A purely larval muscle, aborting at metamorphosis. 



M. intermandihularis -posterior (m.i.m.). Driiner (1901); Luther 

 (19 14); Edgeworth (1920 et seq.). 



Mylohyoideus anterior Fischer (1843); Mivart (1869); Osawa (1902). 

 Partie anterieure du mylohyoidien . . Rusconi (1854) 



Mylohyoideus . Schmidt, Goddard and van d. Hoeven (1864). 



Intermaxillaris anterior . . Hoffman (1873-8); v. Plessen and 



Rabinowicz (1891). 

 C2mv(post) Ruge (1897). 



From the above list of synonyms it will be seen that certain authors 

 have called this the anterior part of the muscle, owing to the fact that 

 they have mistaken the M. interhyoideus for the posterior part. 



