1038 PRINCIPLES OF STRATIGRAPHY 



emus, and the extinct /Epyornys and the Moas). The majority of 

 birds have the power of flight to a greater or less extent, some forms 

 being able to remain in the air for a long time (gulls, petrels), 

 though flightless forms exist in several orders of the Euornithes. 

 Some are especially adapted to a natatory existence (penguins, 

 ducks, etc.), while others spend much of their life wading in streams 

 and ponds (herons, storks, ibises, cranes, snipes, etc.). 



Mammalia. This, the highest class of vertebrates, is primarily 

 adapted to a terrestrial life, though volatorial or atmonektonic 

 types (Chiroptera, or bats) and natatorial or halo- and limnonek- 

 tonic (hydronektonic) types (Cetacea, or whales, and Sircnia, or 

 sea-cows) are also known. Among the terrestrial mammals, climb- 

 ing or arboreal types, running and walking or cursorial types, leap- 

 ing or saltatorial types, and burrowing or fossorial types are dis- 

 tinguishable. 



BIBLIOGRAPHY XXVIII. 



1. AGASSIZ, ALEXANDER. 1888. Three Cruises of the Blake. 2 vols. 



Bulletin of the Museum of Comparative Zoology, Vols. XIV, XV. 



2. BROOKS, W. K. 1881. Developpement de I'huitre Americaine. Archives 



de Zoologie Experimentale et Generale, T. IX. Notes et Revue, pp. 

 xxviii-xxix. 



3. CHAMBERLIN, THOMAS C. 1898. A Systematic Source of Evolution 



of Provincial Faunas. Journal of Geology, Vol. VI, pp. 597 et seq. 



4. CHUN, CARL. 1888. Die pelagische Thierwelt in grosseren Meerestiefen 



und ihre Beziehungen zu der Oberflachen Fauna. Bibliotheca Zoologica, 

 Heft I. 



5. CLARKE, JOHN M. The Naples Fauna, Pt. I. Fifteenth Annual Report 



of the New York State Geologist. 



6. CLARKE, J. M., and RUEDEMANN, RUDOLF. 1912. The Eurypte- 



rida. Monograph of the New York State Museum, No. XIV, and plates. 



7. CONN, H. W. 1885. Marine Larvae and Their Relation to Adults. 



Studies of the Biological Laboratory of Johns Hopkins University, Vol. 

 Ill, pp. 165-192, pis. VIII, IX. 



8. DALL, WILLIAM H. 1890. Deep vSea Molluscs and the Conditions 



Under Which They Live. Presidential Address. Biological Society, 

 Washington. Proceedings, Vol. V, pp. 1-27. 



9. DANA, JAMES D. 1872. Corals and Coral Islands. 



10. DARWIN, CHARLES. 1841. Voyage of the Beagle. 



11. DAVIDSON, TH. 1886. A Monograph of the Recent Brachiopoda. 



Transactions of the Linnaean Society of London. Zoology, IV. 



12. DAVENPORT, C. B. 1903. Animal Ecology of the Cold Spring Sand 



Spit. University of Chicago, Decennial Publication, X. 



13. FISCHER, PAUL. 1887. Manuel de ConchyHologie. Paris. 



14. FUCHS, TH. 1882. Ueber die pelagische Flora und Fauna. Ver- 



handlungen der koniglich-kaiserlichen geologischen Reichsanstalt in 

 Wien, pp. 49-55. 



