288 PEOP. W. K. PAEKBE ON THE STEFCTUEE AND 



sinuous lower edge it forms a large overlapping eave to the tympanic cavity ; this is 

 oblique, dipping backwards. 



The jugal does not finish the facial series of splints in the Crocodilia ; another bone, 

 the quadrato-jugal {q-j), overlaps the quadrate, and is in turn overlapped by the st3'liform 

 jugal ; the shape of this bone is falcate, its sharp blade running obliquely upwards and 

 forwards, strongly binding the antero-inferior region of the quadrate {q). 



The palatine region (PI. LXVI. fig. 3) is now becoming well floored with bone ; but 

 there is a large trowel-shaped tract of the chondrocranium unfloored in the middle ; its 

 narrow end is behind, and it is lost between the pterygoids [pg). The palatines (pa) 

 are here nearer each other than the maxillaries ; but the vomers («) and the basal bar 

 {]).e,2).s) can be seen between them at their closest part. The amount of bony deposit 

 in these investing tracts, and its relation to the endocranium is to be seen in the sectional 

 views (Pis. LXVI., LXVII.) ; but these views are most important for elucidating the 

 palatine region. Seen from below (PI. LXVI. fig. 3) the palatine bones are like falcate 

 blades, with their broad fore end applied obliquely to the gently .scooped margin of the 

 palatine plate of the maxillary, right and left. 



The outline of the palatine bones is convex in front and externally, convex also along 

 their inner edge, and also notched there in front, and concave on their postero-external 

 margin ; their hinder part is a sharp hook turned outwards. 



Their exposed upper surface (PI. LXVI. figs. 1 & 4) is of less extent than the palatal 

 part ; their outer edge is thickening into a rather solid tract of bone. All this will be 

 better understood by reference, also, to the sections (PI. LXVI. fig. 10, and PI. LXVII. 

 figs. 1. 2,])a); in these also will be seen the thickness, width, and relations of the 

 vomers {v). 



These latter bones (PI. LXVI. fig. 3) are long, flat styles, curved, and placed back to 

 back. In front (PI. LXVI. fig. 9, v) they are V-shaped in section, but afterwards flat, and 

 having their plane dipping towards each other (fig. 10, v). They overhxp the maxillary 

 palatine plate at their folded fore end ; behind, they reach the pterygoids {pg). These 

 latter bones (PL LXVI. figs. 1 & 3, and PI. LXVII. figs. 5-7, sections) are two 

 coadapted wings of bone, binding the palatine series well together, and forming a 

 strong underfloor to the basisphenoidal region of the skull. The pterygoid suture is 

 imperfect before and behind ; in front, the slightly diverging processes are subtubular, 

 and enclose the narial passage (PI. LXVII. fig. 6, iig, i.n) ; this is where the palatines 

 {■pa) end. Then (PI. LXVI. fig. 3, and PI. LXVII. fig. l,pg) these bones spread out 

 into broad wings, a rounded notch lying between their widest expansion and the basi- 

 cranial hinder part. The hind margin of the two bones is notched in the middle, then 

 sinuous, and then becomes dilated outwards and backwards to embrace the fore j)art of 

 the auditory capsules and their enclosing bony plates, the " basitemporals " {b.t). The 

 outspread fore wings of the pterygoids (PI. LXVI. fig. 1, pg) descend as well as diverge, 

 and are finished externally with a blunt retral hook. This part is ridged in the middle, 



