24 THE MYOLOGY OF THE RAVEN. 



In Fig. 7, and otlier illustrations to this work, I 

 have made careful drawings of these parts, and en- 

 deavoured to present this group of muscles in such a 

 manner as they can best be seen and studied. 



The following are presented for our examination : — 



21. Mylo-hyoideus. 25. Sterno-hyoideus. 



22. Stylo-liyoideus. 26. Depressor-glossus. 



23. Genio-hyoideus. 27. Cerato-glossal. 



24. Cerato-hyoideus. 



21. The mylo-hyoideus^ (Figs. 5, 11, and 17). — This 

 muscle arises on the inner side of the mandible, just above 



1 Professor Hans Gadow sees two parts to the mylo-hyoideus in 

 birds, his M. mylo-hyoideus anterior corresponding to my mylo- 

 hyoideus^ as shown by me in Fig. 11 of the present work (see 

 Bronn's Klassen, vi. Band, pp. 304-307). 



To me, the m. mylo-hyoideus posterior of Gadow did not seem 

 to be sufficiently evident in the Baven to merit a separate desciip- 

 tion, and it is in no way so distinct a muscle as he figures it in liltea 

 darwini (I.e., Fig. 1, M.H.^a, p. 306). 



Nevertheless, it has been vai'iously considered by other ana- 

 tomists, and Gadow offers us the following synonymy and remarks 

 thereon : — 



" 103. 1. Grupe des M. mylo-hyoideus. 



103a. M. mylo-hyoideus anterior. 

 M. genio-hyoidean. Vicq d'Azyr, 1773, p. 585, No. 1. 

 Mylo-liyoidean. Cavier. Duvernoy, p. 5, No. 1. 



,, Gervais et Alix, p. 19. 



Mylo hyoideus transversus. Tiedemann, § 90, No. 1. 



Nitzsch, p. 134, No. 2. 

 Mylo-hyoideus ohliqutis. Kutorga, p. 20. 

 Khomhoideus juguli. "Wiedemann, p. 70. 

 Querer Unterkiefermuskel oder vorderer, oberfliichlicher Kiefer- 



Zungenbeinmuskel. Meckel, p. 409, No. 2. 

 3fylo-glossus s. transversus mandibulce. Gurlt, p. 14. 

 Uylo-hyoideus. Schneider, p. 145 ; Gadow. 

 ,, Watson, p. 136. 



" Dieser Muskel erscheint nach Abtragung der Ilaut zwischen den 

 heiden Unterkieferiisten. Er entsjjringt von der Innenfliiche, oder 



