BIRDS OF OLD 79 
for them. When, in 1877, a more complete 
example was found, the existence of teeth was 
unmistakably shown; but in the meantime, 
in February, 1873, Professor Marsh had an- 
nounced the presence of teeth in Hesperornis, 
and so to him belongs the credit of being the 
discoverer of birds with teeth. 
The next birds that we know are from our 
own country, and although separated by an in- 
terval of thousands of years from the Jurassic 
Archeopteryx, time enough for the members 
of one group to have quite lost their wings, they 
_ still retain teeth, and in this respect the most 
bird-like of them is quite unlike any modern bird. 
These come from the chalk beds of western 
Kansas, and the first specimens were obtained 
by Professor Marsh in his expeditions of 1870 
and 1871, but not until a few years later, after 
the material had been cleaned and was being 
studied, was it ascertained that these birds were 
armed with teeth. ‘The smaller of these birds, 
which was apparently not unlike a small gull 
in general appearance, was, saving its teeth, so 
thoroughly a bird that it may be passed by with- 
out further notice, but the larger was remark- 
