~_M. adductor mandibulae externus:_~ _a_) ~_pars superficialis:_~ parts 1 and 2 of M. temporalis, Gadow, 1891:320-321--part of M. temporal, Shufeldt, 1890:16, figs. 5 and 7--part of M. adductor mandibulae externus, Edgeworth, 1935:58-60--M. capiti-mandibularis medius and profundus, Adams, 1919:101, pl. 8, fig. 1. _b_) ~_pars medialis:_~ ? parts 1, 2 and 3 of M. temporalis, Gadow, 1891:320-322--part of M. masseter and ? part of M. temporal, Shufeldt, 1890:16-18, figs. 5, 6, 7 and 11--part of M. adductor mandibulae externus, Edgeworth, 1935:58-60--M. capiti-mandibularis superficialis, first part, Adams, 1919:100-101, pl. 8, fig. 1. _c_) ~_pars profundus:_~ part 2 of M. temporalis, Gadow, 1891:321, table 27, fig. 2--part of M. temporal and ? part of M. masseter, Shufeldt, 1890:16-18--part of M. adductor mandibulae externus, Edgeworth, 1935:58-60--? part of M. capiti-mandibularis medius and all of pars superficialis, second part, Adams, 1919:100-101. ~_M. pseudotemporalis profundus:_~ M. quadrato-maxillaris, Gadow, 1891:322-323--M. pterygoideus externus, Shufeldt, 1890:20-21, figs. 3, 5 and 11--part of M. adductor mandibulae medius, Edgeworth, 1935:58-59--? part of M. pterygoideus posterior, Adams, 1919:101, pl. 8, figs. 2 and 3. ~_M. protractor pterygoidei:_~ part 4b of M. temporalis, Gadow, 1891: 322-323, table 27, fig. 4--part of M. entotympanious, Shufeldt, 1890:19-20, figs. 3 and 11--part of M. spheno-pterygo-quadratus, Edgeworth, 1935:57. ~_M. depressor mandibulae:_~ M. digastricus s. depressor mandibulae, Gadow, 1891:318-319--M. biventer maxillae, Shufeldt, 1890:18-19, figs. 3, 4, 5, 6, 7 and 11. ~_M. pseudotemporalis superficialis:_~ M. spheno-maxillaris, Gadow, 1891:323--part of M. temporal, Shufeldt, 1890:16--part of M. pseudotemporalis, Hofer, 1950:468-477--part of M. adductor mandibulae medius, Edgeworth, 1935:277. ~_M. adductor mandibulae posterior:_~ ? part of M. temporal, Shufeldt, 1890:16--part of M. adductor mandibulae medius, Edgeworth, 1935:58-59--? part of M. pterygoideus posterior, Adams, 1919:101, pl. 8, figs. 2 and 3. ~_M. protractor quadrati:_~ part 4a of M. temporalis, Gadow, 1891:322-323, table 27, fig. 4--part of M. entotympanicus, Shufeldt, 1890:19-20, figs. 3 and 11--part of M. spheno-pterygo-quadratus, Edgeworth, 1935:57. The terminology adopted by me is that of Lakjar (1926) except that the divisions of _M. depressor mandibulae_ are designated by the Latinized equivalents of the names used by Rooth (1953:261-262).