0. C. Marsh— Vertebrate Life in America. 347 
Cretaceous. Of Crocodilia ae bi ge arse vertebree, Amer- 
ica, so far as we know, has Specimens similar to those 
so termed in Europe, are noe renee here, but they per- 
tain to Dinosaurs 
Tn the Kocene fresh-water beds of the West, Crocodilians 
are especially abundant, and all, with the exception of Limno- 
ATipabE The Miocene lake-basins of the same olen 
contain no remains of Crocodiles, so far as known, and the 
Pliocene deposits have afforded a, a single species. The 
Tertiary marine beds of the Atlantic Coast contain com- 
paratively few Crocodilian remains, and all are of modern 
ern type. In the Eocene lake-basin 
mains of Lizards are very numerous, aa indicate species much 
larger than any existing to-day. Some of these, the Glyptosau- 
ride, were protected by a highly senatnerited bony coat of mail, 
and others were covered with scales, like recent Lizards. A 
few resembled, in their more important characters, the modern 
Iguana. The genera best represented in the Kocene, are, Glyp- 
tosaurus, Iguanavus, Oreosaurus, Thinosaurus, Tinosaurus and 
Saniva. Some of thesegenera appear to eth continued into the 
Miocene, but here, as well as in the Pliocene, few remains of 
this group have been found. It is not Seapmobatile that some 
of our extinct Reptiles may prove to belong to Rynchocephala, 
but at present this is uncertain. The genus Notosaurus, from 
Brazil, has biconcave vertebre, and some other characters 
which. point to that group. No Dicynodonts or Theriodonts 
have as yet been found in this country. 
The first American Serpents, so far as now known, appear 
in the Kocene, which contains also the oldest European species. 
On the Atlantic border, the genus Titanophis (Dinophis) is 
represented by several species of large size, one at least thirty 
feet in length, and all doubtless inhabitants of the sea. In the 
fresh-water Western Kocene, remains of snakes are abundant, 
— all are of moderate size. The largest of these were related 
© the modern Boa Constrictors. The genera described are 
Seti: Lithophis and Limnophis. The Miocene and Pliocene 
