CONTENTS. 



CHAPTER I. 



PAGK 



Introductory account of the skeleton in general .... 1 



CHAPTER II. 



Classification 30 



CHAPTER III. 



Skeleton of Hemichordata, Urochordata and Cephalochordata . 50 



CHAPTER IV. 



Skeletal characters of the Vertebrata. The skeleton in the Cyclo- 



stomata 53 



CHAPTER V. 



Skeletal characters of the Ichthyopsida. Characters of the several 



groups of Pisces 59 



CHAPTER VI. 



The skeleton of the Dogfish (Scyllium canicula) .... 71 



