TUI 
AriHOK’s PEEFACE. 
dates assigned to some parts of those works in the two 
previous volumes. Finally, I have much pleasure in ex- 
pressing my special indebtedness to Dr. F. A. Bather for 
many suggestions made during his careful revision of the 
proofs, for checking several references to the literature and 
Museum Registers, and for passing the final proofs through 
the press during my absence from Europe. Also to Mr. W. D. 
Lang for his ready help when examining the collections, 
for numerous answers to questions, and for the Subject 
Index. I must also thank Miss Drake for the plates and 
figures, and MissB. C. Smith for the Index to the systematic 
names. 
J. AV. GREGORY. 
University of Glasgow. 
April 11 , 1909 . 
