98 
MR. W. K. PARKER ON THE STRUCTURE AND 
which pinch in very little over the orbits, and cover as much surface above as 
the parietals ( p .), for what they lack in breadth they gain in length. The sutures 
are now well finished and dentate, the lambcloidal takes an arcuate turn forwards, 
in the middle, and retreats at the sides, where the parietals are only flanked by the 
unossified margins of the supraoccipital plane. 
The side view (Plate 12, fig. 8) shows well the feebleness of the short straight face, 
and the fruit-like roundness and general convexity of the skull, proper, to which 
no thick-bellied muscles are attached, and over which a strong horny helmet has grown. 
A thin wedge of bone, the facial part of the premaxillary ( px .), runs its point between 
the nasal (n.) and the maxillary {rax. ), above; this is bounded in front by the snout, with 
its cresentic fold over the almost lateral nostril (e.n.). The square-topped maxillary 
takes up much of the outer edge of the nasal, and then runs downwards and back¬ 
wards, where the lacrymal should be, and barely covers the nasal capsule. The antor- 
bital, as well as the lower edge, is thick, and the infraorbital foramen and fossa (V'\) 
are seen in front of the round, stunted rough zygomatic process in which, in this 
specimen, I can find no distinct rudiment of a jugal bone. A small vascular 
foramen is seen above the main passage (V~.) in the hind margin of the fossa. The 
supraorbital part of the frontal ends below in an arcuate line, which is roughly semi¬ 
circular, and straightish in the middle; the orbital plate is most hollow, almost angular, 
where it runs downwards to the orbital foramen for the re-entrance of the 1st branch of 
the 5th nerve (V 1 .). The lower edge of the orbital plate ends in a line parallel with 
its upper edge ; in the notch the orbitosplienoid (o..s.) is seen, and the oblique, but large, 
optic hole (II.). Below the frontal, and behind the maxillary, the palatine (pa.) is seen 
edgewise as it runs upwards to form its basicranial flange, and forwards to assist the 
maxillaries and frontals to finish the antorbital wall. This is clone imperfectly, and a 
considerable lanceolate cartilaginous “ pars plana” is to be seen between the max¬ 
illary and the palatine. At the fore end of that tract I have looked in vain to find a 
lacrymal foramen. The 2nd branch of the 5th nerve (V s .) strongly grooves the outer 
face of the palatine on its journey from the sphenoidal fissure to the infraorbital canal. 
Most of the hind-skull, as seen in this view, is composed of two nearly equal 
tracts of bone, the parietal and squamosal (p., sq.). The coronal suture ends on the 
highest angle of the squamosa], which is not scooped out to form any definite temporal 
fossa, all the space answering to that valley is to be seen in that part of the squa¬ 
mosal which has caught the notched hinder margin of the frontal. This is made into 
a small space for the temporal muscle by the ridge which runs down to form the 
stunted zygomatic process, in the infero-internal face of which the glenoid facet lies. 
Behind this ridge is the pneumatic foramen ( pnf ), then a gentle hollow, and then the 
general convexity over the large air cavity that forms the chamber over the cavum 
tympani. The hamular process of the pterygoid (pp.) and the annulus ( a.ty .) are just 
to be seen, away from the eye, below, and the margin of the occipital plane, behind. A 
gentle concavity is seen between the external or paroccipital edge of the exocci- 
