OF THE SKULL IN THE CHAMELEONS. 89 
Here the palatines (pa) are cut through both in their upper and lower regions, and the 
space between the right and left lower lamine is the postnasal channel (7. 2). The 
maxillary (mz) is lowering down towards the lacrymal bone, and is strongly buttressed 
by the palatines. 
Section 8.—A little further back (fig. 8) the frontal (f) is twice as wide, and has 
acquired a tubercular ridge; its sides turn up and carry the prefrontals (p.f) on 
them; it is still slightly carmate below; the prefrontals are now one third less. 
The nasal channel (7. 2) is now at its most contracted part, and the palatines (pa) 
at their steepest and widest middle part. The maxillaries (mx) are of the same 
shape as in the last section. 
Section 9.—The prefrontals have now become still narrower, and the frontal broader 
(fig. 9, p.f, f); the latter has lost its lower keel; and the crest above is a mass of 
tubercles. The palatines (pa) are separated both from the orbital septum (presphenoid, 
p.s) and from the maxillaries (mz). 
Section 10.—In this section the jugal and jugal processes of the maxillary are not 
retained, but the roof-bones are shown in situ. This slice is through the common optic 
passage (fig. 10, 11) and through the hinder part of the frontal (f), where the tubercles 
crowd between the fenestra and the coronoid suture (see Plate XVI. fig. 3). The 
thick-crested frontal (f/f) is very solid at this part; and at its edges it carries a new 
pair of bones, viz. the postorbitals (pt. 0). Asin the last, the valley is shallower and the 
skull-roof wider. Here the pterygoids (pg) are in section, close in front of the trans- 
palatines (see Plate XVI. fig. 2, t.pa). 
Section 11.—This is behind the orbits and through the alisphenoid and basisphenoid 
(fig. 11, al.s, b.s); and here the second single roof-bone, the “ interparietal” (i.p), is 
cut through, close behind the coronoid suture. Here we see by this and the last sec- 
tions that the cranial cavity is much foreshortened the last contained the fore end of 
that space ; and this part of the cavity is covered by a production of the parietals. This 
middle bone is very solid; its sides are now shelving; and it lies directly on the dura 
mater. The postorbitals ( pt.o) also are shelving, are crested at their outer edge, and 
then run downwards as a thick facial plate. 
Section 12.—In this section (fig. 12) the roof-bone (¢.p) does not rest on the dura mater, 
but is separated from it by a considerable space ; its crest is higher ; and its sides are 
thin, and do not meet the thin hind part of the postorbital (pt.o), which is cut through 
close in front of the ascending process of the jugal (Plate XVI. fig. 1, pt.o, 7). 
Section 13.—This section (Plate XVII. fig. 5) is through the large deep temporal 
spaces and the fore part of the ear-capsule. ‘The roof is partly membranous ; where it 
is covered in above it is not by investing bone but by the bottom of a high wall growing 
from the endocranial roof, or supraoccipital (s.0); the roof-bone is another crest on 
the top of that, a long distance from the cranial cavity. This latter part is thickened 
