SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 56, NO. II. PL. 6 



Fig. 4A. 



Fig. 4b. 



Fig. 4C. 



Fig. 4d. 









v*r^^: 







© 5 • 



Fig. 4E. 



Fig. 4f. 



DEVELOPMENT OF DIGESTIVE CANAL OF ALLIGATOR 



