ONYCHOCEPHALUS BIBRONII. 
partly in the supraocular, and partly in the ocular plates, and are situated 
where the supraocular joins the preocular suture. Plates of the body in 
thirty-seven or thirty-eight longitudinal rows. Tail armed at the point 
with a short, stiff, spine, directed obliquely downwards and backwards. 
Length from nose to tail 11 inches 8 lines; of tail 2 lines. 
This species, like O. Delalandii, lives either in the earth or under stones or masses of wood. 
If the soil, on its being discovered be rather loose, it progresses through it with considerable 
velocity, but when otherwise it abandons the attempt to advance, and rolls itself up in the same 
manner as the species already described. It inhabits the country to the northward of Latakoo, 
and has not yet been found, so far as I know, within the boundaries of the colony. 
The great size of the frontal plate, the breadth and shortness of the anterior frontal and the 
subovate, instead of subtriangular form of the preocular plates, constitute characters by which it 
is readily to be distinguished from O. Delalandii. It differs also from the latter in the eyes 
being partly in the superocular and partly in the preocular, instead of entirely in the ocular, 
as is the case in O. Delalandii. 
