EMYS CONCENTRICA. 
first, and one of the most peculiar, is distinguished by very deep furrows on 
all the dorsal plates, by the whole margin being revolute, and by the spots 
on the sternal plates assuming a radiating instead of a concentric form. The 
second variety (Plate b .) has the vertical plate, the greater part of the neck, 
the feet and tail, as well as the shell, of a black colour, the anterior part of 
the neck and the sides of the head only approaching the usual colours of the 
species. In the third variety (Plate c.) the skin is of a brightish and pale 
green colour, with black lines on the head and neck, and black spots and dots 
on the rest of the body and limbs, the shell being nearly black. This is the 
only variety which I have seen in which the vertical plate has been of more 
than one colour; in all others it is of an uniform black or greenish hue, and 
very distinct from the rest of the head. The fourth variety I was tempted to 
consider as a distinct species when I had seen but few specimens; I had even 
given it the appellation E. livida *; but I have long been convinced that this 
was an error. It is of an uniform livid green colour, with the dorsal scuta 
very slightly furrowed. The sternum is equally without markings, and of a 
dull greenish yellow colour. A fifth variety, which attains to a very large 
size, has the dorsal plates of a rufous or reddish brown colour, with darker 
concentric lines, and the sternum of a light chestnut. 
The usual colours of the species are as follow. The head is greenish with 
numerous black dots; the vertical plate, which is of the form of an elongated 
lozenge, is either green or black; the eyes are bright yellow, with the pupil 
and many minute dots black; the neck, the feet, the tail, and the skin of the 
thighs are all greenish with irregular black dots, most of which are angular; 
the dorsal plates are of a dull olive, with brown concentric rings, and some 
other markings of the same colour are occasionally found, especially on the 
vertebral plates; the sternum is yellowish, with a light brown line running 
within the margin of each plate, usually formed of irregular elongated spots, 
though in some they are quite continuous; within this line are various spots 
and irregular markings of the same colour; and the areola of each plate is in 
most cases orange, gradually fading off into the light ground colour of the 
sternum. 
* Vide Gray, Syn. Kept. p. 27. 
