162 
MR. W. K. PARKER GUST THE STRUCTURE AUB 
not ossify its own alas ; its axillae are shallow. Although elegantly arched in front 
the snout is very wide, and the oblique outer nostrils (e.n.) on each side are sub-tubular 
and very large ; they have outside them well developed labials (u.V.u.V 1 .). 
The roof and floor (fig. 7, al.n. ; fig. 8, s.n .) are very wide tracts of cartilage; there 
is no prenasal rostrum, and the angles of the floor and the pro-rhinals (fig. 8, s.n., p.rh.) 
are large, and end in out-turned hooks ; the septum nasi, above and below, is thick 
and clearly defined. Up to the point where the true palatine cartilage (fig. 8) begins, 
the ethmoidal wing, which is generally thick and somewhat pointed forwards behind 
the outer margin of the inner nostril, is here unusally developed, as in the genus 
Cystignathus (Plate 16) (indeed, in C. iyphoriius it is ossified continuously with the 
ethmoid, Plate 16, figs. 6 and 7). Here it is not ossified, but is of great breadth, and is 
seen outside the post-narial spike of the vomer (nf, v.) —a part which is also, here, 
four times its usual size. Beyond the notch which separates the ethmoidal from the 
palatine regions the cartilage is rather feeble and narrow, and so is the whole palato- 
suspensorial arch, except in its quadrate region behind. 
In conformity with this, the two pairs of bones (pa., pg.), although quite normal, are 
slender and rather feebly developed. 
The pedicle (pel.) is a small osseo-cartilaginous “foot,” gliding on the sub-concave 
facet outside the prootic spur. The angle between the forks of the pterygoid is more 
than a right angle, and in it we see the large, oval, Eustachian opening ( eu.) 
The cartilage of this arch is nowhere obliterated except above the joint (q.c.) where 
the quadrato-jugal (cpj.) has freely grafted itself. 
The condyles are large and normal, the inner convexity being much the larger of 
the two. Outside the suspensorium and its T-shaped splint (sq.) there is a smallish 
crescentic annulus (fig. 11, a.ty.); it is three-fourths of a circle, its width and concavity 
moderate, and its hinder horn two-fold. The stapes (fig. 11, st.) is oval, and has a 
boss ; the columella is slender, the partly ossified proximal end is smaller than usual, 
and there is no inter-stapedial segment. 
The bony rod (m.st.) is almost straight, slender, and partly unossified distally; at 
that part segmentation has taken place, cutting off the symplectic element, or extra- 
stapedial. This cartilage (e.st.) is like the bill of a Spoonbill, and has no supra- 
stapedial fork. The mandible (fig. 9) is quite normal, the condyle (ar.c.) is reniform, the 
coronoid crest (or.) is definite, the dentary (cl.) is nearly half the length of the ramus, 
and the mento-Meckelian ( m.mk .) rather long. 
The stylo-hyal (st.h.) margining the Eustachian opening is confluent with the auditory 
capsule; it passes into a slender cerato-hyal (fig. 10, c.hy.); outside its flexure there is 
a small extra-hyal, and from the arch there is a long slender hypo-hyal horn (h.hy.), 
which curves towards its fellow in front of the great pre-basal notch. 
The basal plate (b.h.br.) is of the average width, and withal, very long also ; its 
lateral lobes are narrow, the hinder longer than the front pair; these grow outwards 
and forwards, those outwards and backwards. 
