CONTENTS 



CHAP. PAGE 



PREFACE vii 



i. the art of imorphology, being a discourse 



upon organic form i 



ii. physiological classification 1 3 



iii. exposed and concealed animals (phanerozoa 



and cryptozoa) 23 



iv. free and fixed animals (eleutherozoa and 



statozoa) 35 



v. mimicry and homoplasy 52 



vi. divergence and parallelism 69 



vii. special convergence 87 



viii. habitudes and attitudes (bionomical con- 

 vergence) 113 



ix. the ways of breathing (respiratory con- 

 vergence) 138 



x. convergence in minute structure (histo- 



genetic convergence) 1 53 



INDEX 173 



tflll 



