REFERENCES TO THE LITERATURE ADDENDA 267 



STOTSENBURG, J. M. 1915 The growth of the fetus of the albino rat from the 

 thirteenth to the twenty-second day of gestation. Anat. Record, vol. 

 9, pp. 667-682. 



VINCENT, STELLA B. 1915 e The white rat and the maze problem. IV. The 

 number and distribution of errors a comparative study. J. Animal 

 Behavior, vol. 5, pp. 367-374. 



WARREN, JOHN 1915 On th eearly development of the inguinal region in mam- 

 malia. Anat. Record, vol. 9, pp. 131-133. 



WIEDERSHEIM, ROBERT 1897 Comparative anatomy of vertebrates. Parker's 

 translation, 2d ed., London. 



