37 
Brachiopods, mostly of the sloping shoulder type, illustrated 
by the genera Terebratula and Rhynchonella. Among bivalve 
mollusks the modern genus of Ostrea, or oyster. 
Imprints of Insects on the lithographic slates. These litho- 
graphic slate beds afford a large number of beautifully preserved 
specimens, as this stone is especially adapted for such preserva- 
tion. Other Articulates, of the class of Crustaceans, from the same 
beds, Limulus, jEger. 
Case 6. — Ammonites, remarkable for size and complexity of 
suture. Many specimens are shown, including the genera Cardio- 
ceras, Arietites, Grammoceras. Some of A rietites are 3 feet in 
diameter. The sutures of some specimens have been painted to 
bring out the markings. Many specimens of Nautilus and allied 
Cephalopods. 
Case 7. — Belemnites, These are allied to modern Cuttle-fish 
and Squids. The only part of the animal usually preserved is the 
internal bone, or pen. Two restorations of the original animal are 
shown. 
Ichthyosaur^ PlesiosauTy and Pliosaur, These are great ma- 
rine reptiles, whose remains are common among the rocks of this 
period. They are here illustrated by a large number of specimens 
and casts. Restorations of the first two may be seen in the Alcove 
at the entrance of Hall 35. A complete head of an Ichthyosaur 
from England is placed between Cases 5 and 6. The animal was 
sometimes 30 to 40 feet in length, and had enormous eyes — some- 
times 15 inches in diameter. The vertebrae were concave and fish 
like, and the animal combined many characteristics of the fish and 
reptile. The Pliosaur was an animal of the same type, even larger 
than the Ichthyosaur. 
Cases 8A, B, C, I>. — The Dinosaurs, or land reptiles, are 
illustrated by bones and vertebrae of the Teleosaur and casts 
showing various parts of the Megalosaur, Pterosaurs, or flying 
reptiles, are illustrated by imprints of wings of the Rhamphorhyn- 
clus, an animal' not unlike the bat in appearance, and by casts 
of the remains of Pterodactyls. 
Cases 8E, F, G, and 9. — Fossils of the Cretaceous period. 
Case 8E. — Here we find the first of modern plants, or A ngio- 
sperms. Imprints of leaves are shown, many being modern genera, 
such as Sassafras, Populites, or poplar, Betulites, or birch and 
Viburnum. 
