0e- 



coe- 



ov > 



FIG. 459a. Digestive canal of a seed- FIG. 471a. Hoasin or Hoatzin. OpisthO' 

 eating bird, a?, oesophagus, cr, comus cristatus. 



crop; pv, proven triculus; gz, giz- 

 zard; /, liver; p, pancreas; cce, 

 caecum; si, small intestine; Zi, 

 large intestine; ov, oviduct; u, 

 ureter; cl, cloaca. 



FIG. 471b. Wing of Opisthocomus, whpn the embryo was about half ripe for 

 hatching, showing the claw on the first digit, rig 1 ; on the second digit, dg*; th 

 rudimentary claw on the third digit, dc/ 3 ', and the rudiment of a fourth digit, dy*~, 

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

 trale; dc 1 , dc 2 , distal carpals. After W. K. Parker. 



[To face p. 546.] 



