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reptiles, are illustrated by imprints of wings of the Rhampho- 
rhynchus, an animal not unlike the bat in appearance, and by 
casts showing remains of Pterodactyls. 
Walls of Hall 59 and Pedestals 1, 2 and 3.— Remains and 
restorations of Ichthyosaur, Pliosaur and Plesiosaur, great marine 
reptiles of the age. The two former often reached a length of 40 
feet, had stout bodies, short necks, enormous eyes, long teeth and 
fin-like tails and paddles. The latter were their organs of locomo- 
tion. The huge eyes and teeth indicate that they were predatory 
and voracious animals, their food being probably fishes and other 
reptiles . 
The Plesiosaur was a smaller and more graceful animal, with 
long neck, small head and powerful paddles, but in habits similar 
to the preceding. All had many fish-like characters. 
Floor Cases A, Hall 59 and A, Hall 36, — Bones of the Din- 
osaurs or “terrible lizards” which inhabited Wyoming in Jurassic 
times. These have been collected by Museum Expeditions. The • 
bones illustrate the great size which these reptiles obtained. One 
thigh bone is nearly six feet long, and weighs 500 pounds, and 
one shoulder blade is 5^ feet long and weighs 400 pounds. The 
animal of which these bones constituted the frame work must 
have been 70 feet long and have stood 18 feet high. Such animals 
are the largest land animals ever known to have existed. 
Cases 8 E, F, Q and 9. — Fossils of the Cretaceous period. 
Case 8 E. — Here we find the first of modern plants, or Angio- 
sperms. Imprints of leaves are shown, many being modem genera, 
such as Sassafras, Populites, or poplar, Betulites, or birch, and 
Viburnum. 
Cases 8 F and Q. — Among bivalve mollusks the order of 
Rudistes is unique, and characteristic of this period. In shells of 
this order one valve is enormously enlarged, and somewhat funnel- 
shaped ; the other valve is small and acts as a lid — Hippurites 
Sphcerulites, Radiolites. Inoceramus also belongs to this order, 
and sometimes reaches enormous size. 
Casts, much enlarged from the original, illustrating the forms 
of Foraminifera, whose shells make up the vast deposits of chalk 
which characterize this period. 
Case 9, Hall 36. — Among Echinoids, the free moving forms 
are vastly in excess of the stemmed — Ananchytes, Holaster, and 
Toxaster. Among Cephalopods are specimens of Nautilus of 
