Illustrations xi 



FIGURE PAGE 



57. Respiratory Organs of Alligator . . 198 



58. Heart of Alligator .... Facing 202 



59. Veins of the Posterior Region of Alli- 



gator ....... 204 



60. Veins of the Anterior Region of the Alli- 



gator ....... 209 



61. Arteries of the Posterior Region of the 



Alligator . . . . . .213 



62. Arteries of the Anterior Region of the 



Alligator ...... 215 



Plates VI to XXVIII. A Series of Figures 

 to Illustrate the Development of the 

 American Alligator . . Following 342 



