ILLUSTRATIONS 



OF 



ZOOLOGY 



TEBRA TES & l^ER TEBRA TES. 



BY 



WILLIAM RAMSAY SMITH, B.Sc, 



DEMONSTRATOR OF ZOOLOGY, UNIVERSITY OF EDINBURGH, 



AND 



J. STEWART NORWELL. 



EDINBURGH AND LONDON: 

 YOUNG J. PENTLAND. 



1889. 



