BIBLIOGRAPHY.* 
GENERAL ZOOLOGY. 
Elements of Comparative Anatomy. By Carl Gegenbaur. London, 
1878. 
' A Manual of the Anatomy of Vertebrated Animals, By T. H. Hux- 
ley. London, 1871. 
A Manual of the Anatomy of Invertebrated Animals. By T. H. 
Huxley. New York, 1878. 
Forms of Animal Life. By George Rolleston. Oxford, 1888. 
Coues and Kingsley’s Standard Natural History. 6 vols. Boston, 
1884-85. 
Handbuch der Zoologie. Band 1, Wirbelthiere, Mollusken und Mol- 
luscoiden, von J. Victor Carus, Leipzig, 1868-1875 ; Band 2, Arthropo- 
den, von A. Gerstaecker ; Raderthiere, Wirmer, Echinodermen, Ccelen- 
teraten und Protozoen, von J. Victor Carus, Leipzig, 1863. 
Bronn’s Classen und Ordnungen der Thierreichs. Protozoa, Radiata, 
Crustacea, Amphibia. (Other parts incomplete.) Leipzig und Heidel- 
berg. , 
Wiedersheim. Elements of the Comparative Anatomy of Verte- 
brates. 1886. 
Parker. On Mammalian Descent. London, 1885. And his workson 
the morphology of the skeleton of fishes, reptiles, birds, and mammals. 
The Anatomy of Vertebrates. By R. Owen. 3vols. London, 1868. 
A Key to the Birds of North America. By Elliott Coues. Boston. 
Ridgway’s Manual of North American Birds. 1887. 
The Birds of North America. 3 vols. By S. F. Baird, T. M. 
Brewer, and R. Ridgway. Land Birds. Boston, 1874. 
Contributions to the Natural History of the United States. By L. 
‘Agassiz. 4 vols. Boston, 1857-1862. 
Mind in Nature. By H.J. Clark. New York, 1865. 
Manual of the Vertebrates of the Northern United States. By D. 8S. 
Jordan. Fifth edition. Chicago, 1888. 
Seaside Studies in Natural History. By E. C. Agassiz and Alexander 
Agassiz. Radiata. Boston, second edition, 1871. 
Introduction to Entomology. By W. Kirby and W. Spence. 4 vols. 
London, 1828. 
* Works used in the preparation of this volume, with the titles of others indispen- 
suble to the student. 
