252 



ZOOLOGY 



FIG. 68. Shell gallery, British Museum Natural History, London, showing large 

 models of cephalopods suspended from the ceiling. 



than at present, and were especially represented by the 

 ammonites, sometimes as large as a cart wheel. 



References 



BINNEY, W. G. A Manual of American Land Shells. Bulletin 28, U. S. 



National Museum, 1885. 

 PELSENEER, PAUL A. A Treatise on Zoology. Edited by E. Ray Lan- 



kester, Part V, 1906. 



ROGERS, JULIA E. The Shell Book. Nature Library, 1913. 

 BAKER, F. C. The Mollusca of the Chicago Area. Bulletin III, Chicago 



Academy of Sciences. Part I, 1898; Part II, 1902. 

 KEEP, JOSIAH. West Coast Shells, Revised Edition, 1912. 



