172 MR. W. K. PARKER OJif THE STRUCTURE AND 



tliird of the mid skull, runs a little into the wings below, and above creeps along the 

 septum nasi almost to the end of the snout («/.;/.). The whole of the large ear-shaped 

 superorbital tract (s.oh.) is luiossified ; it is thrice as large as in the last. The optic 

 fenestra (II.) is twice as large as in the last. In that species the flat mid skull was 

 widest behind ; in this, the skull widens and bulges from behind forwards. With the 

 exception of the top of the septum, all the nasal region is unossified ; and in this kind 

 the roof and floor are equal, and there is no rostrum. The pro-rhinals ( p.rh.) are 

 very wide, and have the shape of the angular lobes (right and left vi' s.n.). 



Here the snout is almost as broad and transverse as in the Indian Polypedatidae ; 

 the labials {u.lKu.l'-.) are nonnal. The palato-suspensorials are curiously different in 

 these two kinds : here the ethmo-palatine {c.jkl) is broader ; the pre-palatine a sharper 

 adze blade, and the post-palatine cartilage retains a greater breadth ; it ends in this, 

 as in the other, in solid condyles — both of pedicle and quadrate, as in Pelodri/as. 

 But in this the palatine {[m.) is a mere needle of bone, whilst the pterygoid (j^g-) 

 is broader ; it is of necessity longer, on account of the greater retreat of the quad- 

 rate : tliis latter part is not ossified. 



In tliis species the Eustachian openings (en.) are large and nearly circular, as in the 

 last; but the mner nostrils (in.) are still larger; they are oval, and look obhquely 

 inwards and forwards. 



The annulus (a.tij.) is large, but unclosed; the stapes (figs. 7 and 9, st.) large and 

 sub-oval; it is but little produced outwards. The bony medio-stapedial {m.st.) has a 

 very tliick, sohd, proximal part, from the core of wliich an ear-shaped inter-stapedial 

 lobe {m.st'.) passes inside the stapes. The shaft is long, and in front the unossified 

 extra-stapedial (e.st.) grows as a narrow tongue, bent on the core of the shaft, and 

 having a lobate edge, but no distinct supra-stapedial. 



The stylo-hyal (fig. 9, st.h.'-') is confluent above ; it widens downwards into the cerato- 

 hyal (fig. 8, c.hy.), which soon lessens again, and becomes a long, delicate, retral, non- 

 lobate hypo-hyal {h.hj.). There is no front lateral lobe to the very short basal 

 cartilage, which tends to develop a hinder segment [h.hr'.) ; this exists as a very rare 

 median lobe between the long, slender sub-arcuate thyro-hyals {t.hy.). 



The mandible is normal, is very long and slender, and has a distinctly lobate 

 coronoid process to the articulare (fig. 8, ar.). 



The mento-MeckeUans {m.mk.) are large; the feeble dentaries (d.) reach half-way 

 alontr the ramus. 



Tlie Investing bones are, on the whole, about as thin and delicate as In the last ; but 

 the roof-bones are wider by one-third. The fronto-parietals (fig. Q,f.p.) partly overlap 

 the ear-capsule, and nearly reach tlie ethmoidal wings. They are sigmoid in outHue, 

 and bend Inwards, first behind tlie fontanelles, and again at Its fore end ; then they 

 lessen this space shghtly, and end in a rounded lobe. The nasals {n.) are large, thin, 

 crescentic shells. The premaxillarles, maxlllaries, and quadrato-j ugals {p.c, mx:, (j.j.), 



* Tlie lop of llu' stjlu-liyal I.s hiilden in fig. 7. 



