or Toothed Birds of North America. 257 
£ : 
hundred individuals are now in the Yale College Museum; 
ample material to illustrate every important point in their 
osteology. 
“With these fossils, were found also great numbers of Mosa- 
sauroid reptiles, a group which, although rare in Europe, 
attained an enormous development in this country, both as to 
numbers and variety of forms. Remains of more than fourteen 
hundred individuals, belonging to this order, were secured 
during the explorations of the last ten years, and are now in 
the Museum of, Yale College. : 
“The most interesting discoveries made in the Jurassic for- 
Sa were the gigantic reptiles belonging to the sub-order 
2 
discovered. Another remarkable group of large reptiles 
found in the same formation were the Stegosauria. Other 
Dinosaurs from the same horizon, the “ Atlantosaurus beds,” 
show that this was the dominant form of vertebrate life in that 
age, and many hundred specimens of these reptiles are now in 
the Yale Museum. In a lower horizon of the same formation, 
trom North America, as well as the first Chiroptera, and Mar- 
‘Supialia. Abundant material also was found in the same re- 
ion to illustrate the genealogy of the horse, and a memoir on 
this subject is in course of preparation.” 
