652 



RESPIRATORY AND BUOYANCY SYSTEMS 



Flint, J. M. 1906. The development of 

 the lungs. Am. J. Anat. 6:1. 



Goodrich, E. S. 1930. Studies on the Struc- 

 ture and Development of Vertebrates. 

 Macmillan and Co., London. 



HelfT. O. M. 1924. Factors involved in the 

 formation of the opercular leg perfora- 

 tion in anuran larvae during metamor- 

 phosis. Anat. Rec. 29:102. 



Locy. W. A. and Larsell, O. 1916a. The 



embryology of the bird's lung. Based on 

 observations of the domestic fowl. Part 

 I. Am. J. Anat. 19:447. 



and 



1916b. The embry- 



ology of the bird's lung. Based on obser- 

 vations of the domestic fowl. Part II. 

 Am. J. Anat. 20:1. 



Maximow, A. A. and Bloom, W. 1942. A 

 Textbook of Histology. W. B. Saunders 

 Co., Philadelphia. 



Noble, G. K. 1925. The integumentary, 

 pulmonary and cardiac modifications 

 correlated with increased cutaneous res- 

 piration in the Amphibia; a solution to 

 the "hairy frog" problem. J. Morphol. 

 & Physiol. 40:341. 



. 1931. The Biology of the Am- 

 phibia. McGraw-Hill Book Co., Inc., 

 New York. 



Palmer, D. W. 1936. The lung of a human 

 foetus of 170 mm. C. R. length. Am. J. 

 Anat. 58:59. 



Ritter, W. E. and Miller, L. 1899. A con- 

 tribution to the life history of Autodax 

 lugubris Hallow., a Californian salaman- 

 der. Am. Nat. 33:691. 



