Description of the Figures. 55 



Tig. 8. Larynx of Chasmarhynckus mtdicoUis, seen from in front : of the natural size. 

 Fig. 8*. The same magnified. 



a. Trachea, a. Lateral muscles of the trachea, i. Musculus sternotrachealis. c. Muscles 

 of the larynx. II. Second bronchial ring, the ends of which are covered by muscle. 

 Fig. 9. The same from below. The letters as before. 

 Fig. 10. The same from the side. The letters as before. 



II. Second bronchial ring, the ends of which are covered by muscle, while the 

 first is invisible^ and is covered by muscle across its whole breadth. 



Fig. 11. The lower edge of the bony larynx of C. nudicollis. 0. Pessulus. </. Outer 

 and lower edge of the larynx, u". Cartilaginous continuation of the larynx into the 

 tympanic membrane. 



Fig. 12. Lower face of the larynx of CJiasmarhpichus nudicollis, with the first 

 bronchial ring. The tympanic membrane has been removed. 



I. First bronchial ring, c, c' . Muscle of the anterior portion of the larynx, which 

 covers the end of the first (and second) bronchial ring. c^. The portion of muscle, which 

 covers the inner vocal cord 0, and is continued forwards in the middle line of the pessulus. 

 c". Muscle of the hinder face of the larynx, which covers the cartilaginous projection 

 (0" Fig. 11), and the ends of the first (and second) bronchial ring. d. Labium 

 externum. 



Fig. 13. Lower face of the larynx of C. nudicollis, and the commencement of the 

 bronchi. 



m. Tympanic membrane. 0. Pessulus. II. Second bronchial ring. Letters as 

 in Fig. 12. 



Fig. 14. Diasrrammatic section throug'h the trachea and bronchi of C. nudicollis. 

 a. Trachea, b. Larynx, b'. Pessulus. c. Superficial layer of muscle, which is 

 attached to the whole breadth of the first bronchial ring. c^. The deeper layer, which 

 is continued into the mucous membrane c^, between the larynx and the first bronchial 

 ring. d. Labium externum glottidis, outer vocal cord, d' . Inner vocal cord. m. Tympanic 

 membrane. 



PLATE II. THAMNOPHILUS, MYIOTHERA, FURNARIU8. 



Fig. 1. Larynx of Thamnophilus naevius, x 7. 



a. Membranous portion of the trachea, b. The fine half-rings in it. c. Lowest 

 complete ring of the trachea, d. Musculus sternotracJiealis. d'. The second head, where 

 it is fastened to the lateral cord behind the laryngeal muscle, by the membranous portion 

 of the trachea, e. Laryngeal muscle. 



Fig. 2. Larynx of Thamnophilus cristatus Pr. M. The letters as before : x 6. 

 Fig. 3. Larynx of T. guttatus Spix. [Lanius tneleager Lieht.), x 8 : the letters as 

 before. 



f. Lateral cord, which connects the fine half-rings of the trachea. 



