LIST OF ILLUSTRATIONS 
PAGE 
. (2) TRANSVERSE SECTION THROUGH EMBRYO DURING 
THIRD Day, (6) DIAGRAM OF THE CIRCULATION OF 
THE YOLK-SACK Cai ie ee See See ae 281 
. Hyorp Bone oF Crow. ..... 4s @ Soe e 282 
. DIAGRAMS OF AORTIC ARCHES (2) ON THIRD Day, (4) on 
FIFTH OR SIXTH Day » oe. 283 
. DIAGRAM SHOWING AORTIC ARCHES IN (a) LizarD, (4) 
Birp, (¢c) MAN... . . o 4 2% A 284, 
. WING OF HoatTzin (a2) Youne, (4) MATURE . 289 
. CONE CHARACTERISTIC OF THE STRUCTURE OF BLUE 
FEATHERS. . : ee @ « 209 
. SNIPE’s TAIL-FEATHER Y. Sal Se Os 309 
. STERNUM OF OSTRICH .... . : : - 383 
SPINAL FEATHER TRACTS OF SNIPE AND BLACKBIRD . 384 
. ALBATROSSES ON NEST .... ..... 3 399 
