27 i MYOLOGY or TUE TONGUE OF PAKEOTS. 



PLATE XXVII. 



i'ig. 12. Chrysalis ocJirocepJtala. Dorsal view. The trachea has boon turued over f o tliu right in order to 

 show t.ho origins and insertions of the thyrohyoidcus and ihyroglossua, the latter of which 

 has no real origin, but lies free iu the middle line above the basihyal. On the left only 

 a i)ortion of 1 lie sfcylohyoidcus has been represented sufficient to show its insertion and general 

 course. The geuiohyoideus and steruohyoideus have been removed upon the right. (Mag- 

 nified 1.}.) 



Fig. 13. Cacatua f/ulcrita. Dorsal view, with the trachea turned over to the right and only sufTioicnt of the 

 stylohyoideua represeu tod upon the left to show its insertion. The geiiiohyoideus has been removed 

 upon both sides. (Magnified 1|.) 



FiiT. 14. CIiri/siAis panamcnsk. Dorsiil view. The trachea has boeu turned over to the right in order 

 to show the origins and insertions of the thyrohyoideus and thyroglossus, and the peculiar 

 connection of the latter with the sternohyoideus. Only sufficient of the stylohyoideus has been 

 left to show its insertion. The genioglossus has been removed upon both sides. (Magnifitd 1^.) 



Fig. 15. Falttanis crithams. Dorsal view, but with the trachea turned over to the right, and with the 

 thyroglossus diss(^cted away from its origin, in order to reveal the thyrohyoideus. I'pon the 

 left, but not upon the right, the full extent of the posterior mylohyoideus and sternohyoideus 

 has been, represented. The geniohyoideus has been removed upon both sides. (Magnified Ij.) 



Fig. 16. Psittacus erithacus. Dorsal view, with the muscles and trachea in situ. (Magnified li.) 



Fig. 17, Coracopsis vasa. Dorsal view, with the trachea reflected to the right and the origin of the thyro- 

 glossus cut through and turned back in order to reveal the thyrohyoideus. A portion of the 

 mesoglossus muscle has been cut away in order to indicate the mode of termination of the cerato- 

 glossus superior in its sheath. On the left only sufficient of the stylohyoideus has been 

 represented to show its insertion. (PLeduced |.) 



Fig. IS. Strinijops Jiahropiilus. Dorsal view. The trachea and larynx have been turned over to the right 

 and the thyroglossus partially dissected away from its insertion and raised up, in order to reveal 

 the thyrohyoideus. On the right the serpihyoidcus and the greater part of the st3iohyoideus and 

 the sternohyoideus have been removed. The geniohyoideus has been similarly removed upon both 

 sides. (Magnified Ig.) 



Fig. 19. PyrrJiura leucotis. Dorsal view. The trachea has been turned over to the left and only sufficient of 

 the stylohyoideus represented upon the right to show its insertion. The geniohyoideus has been 

 removed upon both s-ides. (Magnified li.) 



ITig. 20. Ara macao. Dorsal view. The trachea has been turned over to the right and a portion of the 

 membrane of the tongue left, in order to show the partial insertion of the thyroglossus to it. The 

 stylohyoideus and geniohyoideus have been removed upon both sides. (Reduced |.) 



Yi". 21. Lorius domiceUa. Dorsal view, after removal of the trachea, thyroid, and membrane of the tongue. 

 The muscles have been dissected out and pulled slightly apart in order to show their relations 

 to the hyoid bone. On the left the thyroglossus, thyrohyoideus, and sternohyoideus have been 

 removed ; and on the right the lateral ceratoglossal, hypoglossus obliquus, and geniohyoideus. 

 On the right also the thyroglossus and thyrohyoideus have been cut through and enough left 

 to show their origin from the parahyal arch. (Magnified 14.) 



Fi". 22. I{esioi- notabilis. Dorsal view after extraction from the head and removal of the membrane of the 

 tongue. The trachea and thyroid have been turned over towards the right to show the insertions 

 of the thyroglossus, thyrohyoideus, and thyrohyoideus accessorius. The genioglossus has been 

 removed upon both sides. (Reduced |.) 



Fi". 23. Luricidas gidcjidus. Dorsal view after removal of the membrane of the tongue. The trachea has 

 been refl.ected to the right in order to show the origins and insertions of the thyroglossus and 

 thyrohvoideus. On the right, only sufficient of the stylohyoideus has been represented to show 

 its insertion. The scrpihyoideus and geniohyoideus are not represented on either side. 

 (Magnified 2.) 



