48 
room x. twelve horny plates on the chest bone or ster¬ 
num, and which withdraw their head and neck 
between the shells, as the Dhor Terrapin ( Emys 
JDhor ), from India $ the Banded Terrapin ( Emys 
Vittata :), and Lake Erie Terrapin {Emys Le- 
sueurii ), from America, These are extensively 
used as food by the Americans. Amongst 
these is a monstrosity with two heads. 
2d. The Chelys ( Chelys ), which have an ad¬ 
ditional horny plate on the front of the chest 
bones, and which bend the neck back under 
the side margin of the shell, as the Eradiated 
Chelys ( Hydraspis radiolata). 
The third kind of fresh-water Tortoises (ZW- 
onyx ), are peculiar for the shell being covered 
with a naked skin, and for only three toes of 
each foot being provided with claws. They, 
like all the other fresh-water Tortoises, are 
strictly carnivorous, and only eat their food in 
the water. Many large specimens of this genus 
are found in the East Indies, and they are con¬ 
stantly seen devouring the human bodies float¬ 
ing down the Ganges. There are to be ob¬ 
served young specimens of two of these species, 
the Hurum Trionyx ( Trionyx Hnrum ), and the 
Punctated Trionyx ( Trionyx Punctatus). The 
latter is peculiar for the leg being covered by a 
moveable flap placed on the sides of the chest 
when drawn up. 
The marine Tortoises or Turtles ( Cheloriice ), 
are 
