Description of the Figures. 57 



a. Lateral muscle of the trachea, b. Azygos muscle at the lower end of the 

 trachea, c. Muscle of the larynx, d. Cleft at the hinder side of the lower part of the 

 trachea filled up by a bony ridge, connected with the pessulus. 



Fig. 4, 5. Larynx of Pipra auricapilla Licht., x 4. Fig. 4, from in front. 

 Fig. 5, from below. 



a. Last tracheal ring. a'. Third bronchial ring. b. Tracheal muscle, d. Laryngeal 

 muscle. 



Fig. 6-8. Larynx of Pipra jiareola, x 6. Fig. 6, 7, from in front. Fig. 8, from 

 behind. 



a. Lateral muscle of the trachea, h. Miiscuhis sternotrachealis. c. Laryngeal muscle. 

 The hinder part of the lower part of the trachea is widely cleft, and in this space is placed 

 a cartilaginous piece, which occupies also the lower ends of the first three bronchial rings, 

 and takes the place of the pessulus. 



Fig. 9-11. Larynx oi Pipra leucocilla, x 6. Fig. 9, 10, from in front. Fig. 11, from 

 behind. 



a. Lateral muscle as far as the third bronchial ring. b. Muscidus slernotracJiealis. 



PLATE V. TROCHILUS, ARUNBINICOLA, PYROCEPIIALUS, MYTOBIUS, 



COLIUS. 



Fig. 1. Larynx of TrochiJus dominicits, x 5- The muscles which covered one side 

 of the larynx are removed. 



a. Larynx, b. First, very thin, c. Second, larger bronchial ring. d. Laryngeal 

 muscle as far as the hinder part of the second bronchial ring. e. Second muscle, which 

 arises from the hinder part of the second bronchial ring, and passes to the anterior face 

 of the three succeeding bronchial rings. 



Fig. 2. The same larynx covered by the first muscle. 

 Fig. 3. Larynx of TrocJiilits domiiiicits, from behind. 



a. Larynx, c. Hinder and triangular end of the second bronchial ring, into which 

 is attached the large laryngeal muscle d. f. Cartilago arytaenoidea. 



Fig. 4. Larynx of ArmuUnicola lencocepJiala D'Orb. Lafr. {Todus leucocepJialus Pall.), x 8. 



a. Lateral muscle of the trachea, b. Muscidus dernotraclieaVu. 

 Fig. 5. The same from below, x 5. 



X. Cartilago arytaenoidea. 

 Fig. 6. Larynx of PyroceplMlus coronatus Gould {3fuscicapa coronata L. Gm.), x 8. 



a. Lateral muscle of the trachea, c. Laryngeal muscle. 

 Fig. 7. Larynx of Pyrocephalus, from below. 



0. Pessulus. d. Inner half-ring. e. Outer half-ring. x. Cartilago arytaenoidea. 

 Fig. 8. Larynx of 3Ii/iobi.us erytlirurus Cab. n. sp., x 8. 

 a. Lateral muscle of the trachea, b. M. sternotracliealis. 



