1220 
MR. W. K. PARKER ON THE STRUCTURE AND 
apart, but as the skull narrows in faster than in the last, these passages are nearer 
together than in it. The nasal roof ( p.n .) is not large, and appears to be imperfect ; 
the floor {s.n.l.) is very wide ; the pro-rhinals (p.rh.) are small and turned inwards ; 
and the angles of the floor are but little dilated, as the maxillaries (onx.) stop their 
outward growth. The palatine bones are rather short ; they are falcate, and hide 
the small ethmo-palatine cartilage, which cannot be traced into the half-used ptery¬ 
goid cartilage, growing inside the pterygoid bone (fig. 7, pg.), which is part of the 
suspensorium (sp.). The bone (figs. 5-7, pg.) is very small and pointed in front, has 
a large foot lying on and fixing the pedicle {pel.) ; and bending suddenly on the inner 
process, the hind part half encloses the smallish, oval Eustachian opening {eu.), and 
then runs down the inside of the quadrate (q.c.). That part is somewhat ossified by 
the quadrato-jugal (q./.); is very high (fig. 7) and forms more than a right angle with 
the basis cranii, but the condyle (q.c.), which is a large sulcate trochlea, only goes as 
far back as to the setting on of the stylo-hyal. A flange-like out-growth of the 
suspensorium is all that remains of the leafy “ orbitar process” {or.p.), it binds on 
the squamosal (sq.). As in the last, the “ annulus ” {a.ty.) is large and perfect ; the 
stylo-hyal (st.h.) is confluent, above. 
The stapes (figs. 9, 10, st .) is sub-oval, and has a boss ; the mediostapedial {m.st.) 
has a large, cartilaginous lobe, but no free segment ; the extra-stapedial {e.st.) is 
spatulate, and has a membranous supra-stapedial ( s.st.). 
The hyo-branchial structures (fig. 8) are similar to those of the last kind, but the 
cerato-hyals (c.hy.) are narrower; the lateral lobes are larger and freer; in the base of 
the hinder pair there is a fenestra ; the thyro-hyals (t.hy.) are much smaller. The 
mandible (fig. 7) is like the last, but the bony tracts are feebler in this young 
individual; the hinge is deep and large. The labials (u.l l .u.l' 2 .) are similar to those 
of B. ornatus, but the second is smaller. 
The investing bones are like those of a Chameleon ; they are crested and ornate 
with “tears” of bone; these are especially developed over the inter-auditory region; 
the roof bones (fig. 5 ,f.p.) are very extended and polygonal, and leave a space in front 
where they narrow out and join with the nasals, obliquely. Behind, they and the 
squamosals (sq.) only leave the epiotic region naked, and their temporal is larger than 
their orbital edge; that free edge is elevated and grooved radially ; the temporal 
suture is sinuous. The nasals (n.) are conchoidal, with a sharp retral facial stem ; 
they are especially perlate on their thickest part in the prefrontal region. The feeble 
premaxillaries {px.) stretch in an arcuate manner under the projecting rounded snout, 
and the nasal processes (fig. 7, n.px.) have their axis almost coincident with the axis 
of the long deep maxillaries {mx.). These latter bones are straight up to the hinge, 
whilst they almost completely overlap the small quadrato-j ugals (q.q.). There is a 
rough notched septo-maxillary {s.mx.) under the outer nostril. 
The squamosals (sq.) have a huge supra-temporal plate, four-sided, irregularly, and 
with the largest, or postero-internal, angle sharply notched. The side view (fig. 7) 
