coe- 



FIG. 459a. Digestive canal of a seed- 



eating bird. e, oesophagus, cr, 

 crop; pv, proventriculus; gz, giz- 

 zard; I, liver; p, pancreas; cce, 

 caecum; si, small intestine; K, 

 large intestine; ov, oviduct; u, 

 ureter; cl, cloaca. 



FIG. 471o. Hoasin or Hoatzin. Opistho- 

 comus cristatus. 



FIG. 4716. Wing of Opisthocomus, when the embryo was about half ripe for 

 hatching, showing the claw on the first digit, dgi; on the second digit, dff; the 

 rudimentary claw on the third digit, dg 3 ; and the rudiment of a fourth digit, dg*; 

 h, humerus; r, radius; u, ulna; re, radiale; ue, ulnare; i, intermedium; c, cen- 

 trale; dc l , dc 3 , distal carpals. After W. K. Parker. 



[To face p. 546.] 



