Fia. 459a.—Digestive canalofaseed- Fic. 471a.—Hoasin or Hoatzin. Opistho- 
eating bird. @, cesophagus, cr, comus cristatus. 
crop; pv, proventriculus; gz, giz- . 
zard; l, liver; p, pancreas; co, 
cecum; si, small intestine; Ji, 
large intestine; ov, oviduct; u, 
ureter; cl, cloaca. 
Fie. 471b.—Wing of Opisthocomus, when the embryo was about half ripe for 
hatching, showing the claw on the first digit, dg!; on the second digit, dg?; the 
rudimentary claw on the third digit, dg’; and the rudiment of a fourth digit, dg‘; 
h, humerus; r, radius; wu, ulna; ve, radiale; we, ulnare; 7, intermedium; c, cen- 
trale; dc}, de®, distal carpals.—After W. K. Parker. 
[To face p. 546.] 
