Xll 
PREFACE. 
nomenclature of this class had been much neglected, and Dr. Harmer’s almost 
complete knowledge of it has been very valuable. 
The kindly interest taken by Dr. P. L. Sclater in the work, and the advice 
he has given about it have been most encouraging. 
D. SHARP. 
University Museum of Zoology, Cambridge, 
September 1st, 1902 . 
