88 
MR. W. K. PARKER OK THE STRUCTURE AND 
fore part of the bone in its toothless alveolar region runs with its fellow close up to 
the alate alisnasal floor; it broadens to send upwards and backwards (see also 
fig. 7, px.) its falcate facial plate. The palatine processes, once very short (fig. 1), 
are now extremely long, they have evidently made their hind part from the paired 
front vomers (fig. 1, v .). Two-fifths of the palatine plate of each maxillary (rax. ) 
comes short of the mid-line, and exposes the long styles running backwards from the 
premaxillaries. The rest of these plates is complete, the termination of them 
behind is in sharp wedges that run between the palatines (pa.). The region between 
the thick edentate margins of the palate is elegantly lanceolate, and is more than a 
third of the general width of the face as seen from below ; it is also high or arched, 
for the fore palate in this type is very hollow. The arched alveolar ridges turn 
inwards to clamp the fore part of the palatines (pa.), and outside the ridges the bone is 
seen, right and left, expanding in a roughly convex manner to form the large facial 
plate (see also fig. 7, mx.). That plate swells suddenly over the lateral ethmoidal 
masses, and in the widest part is burrowed below for the 2nd branch of the 5th 
nerve (V 2 .). The ridge from the infraorbital opening of that burrow runs backwards 
and outwards, and ends hi a short, free, blunt zygomatic process, on which, in this 
stage, I find no trace of a jugal bone. The palatines (pa.), as seen from this aspect, 
are as long as the palatine region of the maxillaries. A considerable right-angled 
space divides the two bones behind, and a more acute-angled gap receives the 
maxillaries in front. 
They are somewhat pinched in, laterally, are slightly bevelled, externally, in front, 
and form a low ridge outside ; each bone is gently hollowed towards its fellow ; the 
two unite and carry on the median suture of the hard palate, which is half the 
length of the basis cranii, including the snout. This view only gives half the 
extent of the palatine bones (see fig. 7, pa.) which have a large orbital develop¬ 
ment. The pterygoids (pg.) have only the average development, their external 
outline is concave as in the case of the palatines; their lower edge is thick, and they 
have a free hamular process, capped, still, with cartilage; they are two-thirds the 
length of the palatines ; they still overlap the cochleae (chi.). Two large bony tracts 
can be seen on each side, the orbital plates of the frontals (f), and the zygomatic 
and postglenoid regions of the squamosals ( sq .). The hind part of the nasal capsules 
(m.tb.) are still uncovered in the inner part of the orbital floor, the infraorbital 
nerve (V 2 .) is seen running under this tract right and left. The pyriform glenoid 
facet (gl.f.) in the back of the zygomatic stump of the squamosal (sq.) is now large, 
and the bone, after swelling to enclose the facet, contracts into a neck, and then, 
hollow within, overarches the auditory capsule ; the bony eave reaches back beyond 
the stylomastoid foramen (VII.) Inside the orbital plate of the frontal a large 
exposed part of the osseous orbitosphenoid (o.s.) is shown as a rounded wing right 
and left. The optic nerve (II.) is escaping from its inner part, and its edge in 
front is notched for the re-entering orbitonasal nerve, which emerges from the 
