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E54 
AME RICAN NATU RALIST, 
AN ILLUSTRATED MAGAZINE 
NATURAL HISTORY. 
EDITED BY 
A. S. PACKARD n EDWARD D. COPE. 
be: ASSOCIATE EDITORS: 
W. N. LOCKINGTON, DEP. OF GEOGRAPHY AND TRAVELS. 
Pror. H. CARVILL LEWIS, DEPARTMENT OF MINERALOGY. 
Pror. C. E. BESSEY, DEPARTMENT OF BOTANY 
Z PORIE T, MASON, DEPARTMENT OF Aieteeceoneea 
fs Pror. HENRY SEWALL, DEPARTMENT OF PHYSIOLOGY. 
Hees Dr. C. O. WHITMAN, DEPARTMENT OF MICROSCOPY. 
> 
VOLUME XVIII. 
PHILADELPHIA : 
PRESS OF McCALLA & STAVELY, 
Nos. 237 AND 239 Dock STREET. 
188 
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