XIV 



LIST OF ILLUSTRATIONS 



Figures 5 and 75 are from preparations kindly lent by Dr. W. H. Dickinson. 

 ■Figures 7 and 36 are from preparations kindly lent by Prof. Bordone 



Uffreduzzi. 

 Figures 91 and 93 are from preparations kindly lent by Mr. E. L. Hunt. 

 Figure 100 is a preparation by Mr. Deller. 

 J'igure 111 is from a preparation kindly lent by Dr. Manson. 



