174 
MR. W. K. PARKER OK THE STRUCTURE AND 
The bone hardly affects the ethmoidal wing, but runs fairly up to the septum nasi 
( s.n .), below; above (fig. 1, eth.), it is very narrow, where it forms an arcuate margin 
to the fontanelle. 
The nasal region is well developed, both as to roof and floor ; it is wholly cartila¬ 
ginous, it is broad, but arcuate (not transverse), in front, and ends in five large, well 
formed processes (figs. 1, 2, and 4). Each outer angle of the primary cornua trabeculae 
(fig. 4, c.tr .), is a large, broad, decurved ear of cartilage, and the pro-rhinals ( p.rh .), are 
long, large, and pedate; the prenasal ( p.n.) is spatulate, and one of the best, in shape 
and size, to be seen in the whole group. Between this bar and the out-turned pro- 
rhinals, the nasal-nerve openings (n.n.) are large. The palato-suspensorials are stouter 
than in the two last; the pterygoid and palatines ( r pg., pa.) are stronger even than 
in II. Ewingii, but the cartilage of the pedicle ( pd.) is much less solid; that of the 
quadrate is equal to what is seen in that species ; this latter part is not ossified. These 
condyles have retreated to a point opposite the hind margin of the stapes ; this is 
intermediate between what we see in the two last kinds. So, also, are the internal 
nostrils ( i.n.), they are sub-oval and oblique, but not to the same extent as in 
II. phyllochroa; the Eustachian openings (eu.) are very similar in all three; they are 
quite circular in this species. The external nostrils (e.n.) and the upper labials 
( u.V-.u.l 2 .) are very similar to those of II. Ewingii. 
The annulus ( a.ty .) is imperfect above, but it is of the average size. 
The stapes and the other linked segments of the ear-chain (fig. 5, st., i.st., m.st .) are 
large ; the proximal segment is oval and unossified, but quite distinct from the solid 
head of the medio-stapedial. 
The extra-stapedial is a long, decurved, spatula, giving off a ligulate cartilaginous 
supra-stapedial {e.st., s.-st.), which like the stylo-hyal ( s.th .) is confluent above. 
The rest of the hyoid band (fig. 3, c.hy.) is rather broad ; it lessens before it turns 
back, has no lobe, and soon melts into the basal plate. 
That plate {b.li.br.) is extremely small, both fore and aft, and has inordinately large 
thyro-hyals {thy.) : its lateral lobes are but little pronounced, especially on the right 
side. The mandible (fig. 3, m.mk., cl., ar.) is normal. 
The investing bones are somewhat denser than in the small Australian Ilylce; the 
fronto-parietals {f.p>) are only one-third as long as the skull, and overlap the marginal 
“ tegmen ” very little; they are small, straight, and gently conchoidal, with only a 
slight temporal dilatation. 
The nasals (fig. 1, n.) are fine large stalked crescentic shells of bone, coming very 
near each other at their inner edge; these bones, and the pre-maxillaries, septo- 
maxdiaries, maxillaries, quadrato-jugals, and squamosals, are all similar to what would 
be found in a young Common Frog of the same size as the adult of this species. 
The parasphenoid and vomers (fig. 2, pa.s., v.) are normal and large; the former lias 
its wings pointed, and not dilated, and the latter are thrown wide apart by the 
dilatation of the basi-nasal tract. 
