X CONTENTS 



Page 



14. The Sense Organs 393 



Evolution and Development of Sense Cells 393 



Cutaneous Senses 395 



Lateral Line Organs 397 



Olfactory Organs 399 



Taste Organs 404 



Visual Organs 406 



Static and Auditory Organs 41 S 



Muscle Spindles 426 



15. The Ancestry of the Vertebrates 427 



Glossary 433 



Index 457 



