OSTEOLEPIDO 77 



281 



Fio. 250. 



Restoration of Glyptopomm. A, ventral, and B, dorsal view of the head, (After Huxley, 

 Slightly modified.) c, clavicle ; d, cleithrum ; e, ethmoid ; fr, frontal ; I, lower jaw ; l.y, lateral 

 gular ; rn.s, median supratemporal : 'nix. maxilla ; np, opercular ; p, pineal foramen ; pa, parietal ; 

 I if, prefrontal ; ;>i, premaxilla ; pn. preopercular; ytf, postf'rontal ; jito, pterotic; s, supra- 

 temponil ; sel, supraclavicle ; xop, subopercular ; r.g, ventral gular. 



pto. 



Tilt. 



St. 



f 



pnix 



9 S P 



FIG. 251. 



Restored head of Iliiloptyi.-hiusAndersoni, Ag. ch, cheek-plates ( = preopercular ? ) ; el, cleith- 

 rum ; civ, clavicle ; ri. dentary ; c, mesethmoid ; /, frontal : g, paired ventral gular ; ioj>, inter. 

 opercular ; l.g, lateral gular: nt.t, median supratemporal ; op, opercular ; p, parietal ; pmx, 

 premaxilla ; pi, ix>st-teinporal ; pt<>, pterotic ; fip, suboperculum ; sp, notch, possibly indicat- 

 ing spiracle ; st, supratemporal. 



