84 
MR. W. K. PARKER ON THE STRUCTURE AND 
Nor has this generalised growth (both of cartilage and bone) allowed any deficiency 
of roof below the parietal region ; there is only one, the main, fontanelle : this space is 
barely covered by the shortish frontal end of the roof-bones ( f.p.). 
The roof-bones are completely re-unitecl , and the frontal suture is partly closed, as 
well as the whole of the sagittal ; the skull is sub-sulcate towards the mid-line 
(fig. 1.). 
These roof-bones leave much of the endocranium uncovered behind as well as in 
front; a little temporal wing, and a moderate orbital plate is formed by them. 
The parasphenoid retains the form it had in the large larva (Plate 2, fig. 2, pa.s.) ; 
and it is very characteristic of Pseudis , being a dagger, gapped at the point, with a 
wide elegant “ guard,” and no “ handle.” 
The large girdle-bone (eth.) extends its osseous substance half across the cheeks, 
half along the internasal region, and it trespasses on the orbito-sphenoidal headland. 
Together, these elements make the interorbital part of the cranium (its anterior 
two-thirds) a boat-like structure, gently narrowing forwards. 
Then, on a sudden, it widens again, passing out into the palatal and nasal 
structures. 
Above (fig. 1, n.), the elegant conchoidal nasals cover much of the roof, and run down 
over the ethmo-palatine wings, but they do not hide the middle over the front 
extension of the creeping ossification from the girdle-bone ; above (fig. 1), the soft pre¬ 
nasal (p.n.) finishes the face. 
The ectosteal palatine (fig. 2, pa.) binds under the half-ossified ethmo-palatine ; it is 
falciform, with the narrow handle inwards, far from that of its fellow of the other 
side. 
Hiding the semi-osseous sub-nasal plate, except in front and in the middle, are 
the two vomers (Plate 2, v.), they are sub-reniform, with a lateral spike ; behind, they 
are massive and dentigerous : this lenticular part is like what is seen in several Frogs 
(both “ Platydactyla ” and “ Oxydactyla ”) from the Notogoea. 
The internal nostrils (fig. 2, i.n.) are large and round ; the external nostrils (fig. 1, e.n.) 
are moderate in size and are guarded by two valvular cartilages, the inner and outer 
upper labials. 
The arc of cartilage running from the palatine to the pterygoid becomes thin, but I 
cannot find that it is segmented; the hitter bone ( pg. ) is pointed in front, then 
becomes very broad, and this wide part forks into the sheath of the pedicle (pd.) 
and a posterior process. 
The posterior process becomes sub-vertical, binding the inside of the suspensorium to 
the condyle of the quadrate (g.c.). 
The inner fork arches inwards and enclothes the stunted pedicle (pd.) up to the 
condyle, which glides on a pad of cartilage on the fore-face of the auditory capsule 
(fig. 2.), 
