x PREFACE 
print a catalogue!”’ . . . Nevertheless I can assure the careful reader 
that all of us who have labored in the present work have, like Epicte- 
tus, “tried incessantly to be accurate —and by this means escaped at 
least a few errors!”’ 
BASHFORD DEAN. 
American Museum of Natural History, 
October 27, 1916. 
