24 THE MYOLOGY OF THE RAVEN. 



In Fig. 7, and other 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-hyoideus. 26. Depressor-glossus. 



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



24. Cerato-hyoideus. 



21. The mylo-hyoideus 1 (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 inylo- 

 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 Raven to merit a separate descrip- 

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

 darwini (I.e., Fig. 1, M.ELp., p. 306). 



Nevertheless, it has been variously 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-hyoidean. Cuvier. Duvernoy, p. 5, No. 1. 



,, Gervais et Alix, p. 19. 



Mylo hyoideus transversus. Tiedernann, 90, No. 1. 



Nitzsch, p. 134, No. 2. 



Mylo-hyoideus obliquus. Kutorga, p. 20. 

 Khomboideus juguli. "Wiedemann, p. 70. 

 Querer Unterkiefermuskel oder vorderer, oberflachlicher Kiefer- 



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

 Mylo-glossus s. transrersus mandibutce. Gurlt, p. 14. 

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

 ,, Watson, p. 136. 



" Dieser Muskel erscheint nach Abtragung der Haut zwischen den 

 beiden Unterkieferiisten. Er entspringt von der Innenflache, oder 



