Vlll PREFACE 



Kellogg, V. L. American Insects, 1905. 



Kingsley, J. S. Textbook of Vertebrate Zoology, 1899. 



Knowlton, F. H. Birds of the World, 1909. 



Korschelt, E., and Heider, K. Textbook of the Embryology of 



Invertebrates, 4 vols., 1895. 



Lang, A. Comparative Anatomy of Invertebrates. 

 Lankester, E. R. A Treatise on Zoology, 1900-1909. 

 Marshall, A. M., and Hurst, C. H. Practical Zoology, 1905. 

 Matthew, W. D. Evolution of the Horse. American Museum 



Journal, Vol. III. Guide Leaflet No. 9, 1903. 

 Morgan, T. H. Regeneration, 1901. 

 Osborn, H. F. The Age of Mammals, 1910. 

 Parker, T. J. Zootomy, 1884. 



- and Parker, W. N. An Elementary Course in Practical 

 Zoology, 1908. 



- and Haswell, W. A. Textbook of Zoology, 1910. 

 Schmeil, O. Textbook of Zoology, 1901. 



Sedgwick, A. Student's Textbook of Zoology, 3 vols., 1898-1909. 



Sedgwick, W. T., and Wilson, E. B. General Biology, 1899. 



Shipley, A. E., and MacBride, E. W. Zoology, 1904. 



Simpson, G. B. Anatomy and Physiology' of Poly gyr a Albolabris 

 and Limax Maximus. Bui. N. Y. State Mus., Vol. 8, 1901. 



Stone, W., and Cram, W. E. American Animals, 1905. 



United States Department of Agriculture. Circulars and Bul- 

 letins. 



Verworn, M. General Physiology, 1899. 



Wiedersheim, R., and Parker, W. N. Comparative Anatomy of 

 Vertebrates, 1907. 



Wilder, H. H. History of the Human Body, 1909. 



Willey, A. Amphioxus and the Ancestry of the Vertebrates, 

 1894. 



Williams, L. W. Anatomy of the Common Squid. American 

 Museum of Natural History. 



Wilson, E. B. The Cell in Development and Inheritance, 1900. 



Zittel, K. von. Textbook of Paleontology, 2 vols., 1903. 



