NO EYES, AND MULTIPLE EYES 213 
It appears that these fish feed chiefly upon 
insect life that skims over the water, and when 
searching for these the anableps swims along 
with the upper part of its eyes exposed above 
the surface, and the lower part beneath. 
The females, which are viviparous and larger 
than the males, carry their young in a bag-like 
structure or pouch formed of thin skin, and 
in this retreat the fry remain until they are 
old enough to look after themselves. 
One of the blennies also possesses a similar 
type of eye to that of the foregoing. 
Mention must be made of the remarkable 
tuatera lizard of New Zealand which, although 
now a normally two-eyed creature, was believed 
in past ages to have possessed a third one 
situated upon the top of its head. 
Traces of this extra eye can be found in the 
reptile at the present day, a rudimentary 
structure, known as a pineal or cyclopean eye, 
reposing at the base of the brain. 
Although this organ, which is visible through 
the somewhat transparent skin of the young 
animal, is now quite useless, it is regarded as 
representing what was once a functional eye in 
the reptile’s ancestors. 
The tuatera grows to a length of about 
twenty inches, and is of an olive or greyish 
tint, speckled with a few yellow dots. During 
