A COURSE IN 

 INVERTEBRATE ZOOLOGY 



A GUIDE TO THE DISSECTION AND COMPARATIVE 

 STUDY OF INVERTEBRATE ANIMALS 



BY 

 HENRY SHERRING PRATT, Ph.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 



