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Case 10. — Among univalve mollusks many modern types will 
be recognized — Turritella^ Natica^ Cerithium^ Strombus, etc. 
Fishes belonging to the order of Teleosts^ or osseous fishes, 
are illustrated by many specimens from the Green River, Wyo- 
ming beds — Priscarare, Diplomystus, etc. These are of modern 
types and related to the perch, herring and the like. The series 
here shown is especially large and fine. 
Sharks of enormous size existed as shown by teeth of the 
Carcharodon may be seen in this case. 
Floor of Hall 36, Pedestal 1. — A restoration showing the 
jaws of Carcharodon, and within these, for comparison, the jaws 
of a modern shark. The ancient Carcharodon was probably 50 
to 70 feet in length. 
Pedestal 2* — Restoration of Hadrosaurus from the Upper 
Cretaceous of New Jersey. This was a huge land reptile, 28 feet 
in length, allied to the Iguanodon. It was probably a vegetable 
feeder, and able to stand and walk after the manner of birds. 
Pedestal 3. — Restoration of a skeleton of Dinoceras. This 
was a five-toed Ungulate of elephantine size, but had no proboscis, 
and was probably like the rhinoceros in its habits. It is marked 
by three pairs of protuberances on its skull which probably bore 
horns. In spite of the size of the animal its brain capacity was 
very small — only one-eighth that of a modern horse, as shown by 
a cast, Case iiD. 
Pedestal 4. — Head of Dinotherium (cast). This was a huge 
animal with a skull three feet long, herbivorous, and remarkable 
for two long tusk-like teeth, projecting downwards. It combined 
the characteristics of the elephant, hippopotamus tapir and 
d ugong. 
Pedestal 5. — A restoration of the skull of Elephas ganesa, 
one of seven species of elephants existing during the Miocene 
epoch in India. This species is remarkable for the length of its 
tusks, in this specimen ten feet long. 
Pedestal 6. — Complete skeleton of Mastodon from Southern 
Michigan. This was the earliest of elephant-like mammals, 
differing from the elephant in having a more elongated body, 
shorter and stronger limbs, fiatter cranium and less complex 
molars. The grinding surfaces of the molars were more or less 
tubercular, in contrast to the ridges which characterize the teeth 
of the elephant. Hence comes the name, mastodon — nipple tooth. 
