A COURSE IN 
INVERTEBRATE ZOOLOGY 
A GUIDE TO THE DISSECTION AND COMPARATIVE 
STUDY OF INVERTEBRATE ANIMALS 
BY 
HENRY SHERRING PRATT, Pu.D, 
PROFESSOR OF BIOLOGY AT HAVERFORD COLLEGE AND INSTRUCTOR IN 
COMPARATIVE ANATOMY AT THE MARINE BIOLOGICAL LABORA- 
TORY OF THE BROOKLYN INSTITUTE OF ARTS AND 
SCIENCES AT COLD SPRING HARBOR, L.I. 
REVISED EDITION 
GINN AND COMPANY, BOSTON 
NEW YORK + CHICAGO - LONDON 
ATLANTA - DALLAS - COLUMBUS - SAN FRANCISCO 
4 
