OSTEOLEPIDOTI 



281 



FIG. 250. 



Restoration of Glyptopomi 



temporal ; 



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

 cleithrum ; e, ethmoid ; fr, frontal ;4, lower jaw ; l.g, lateral 

 maxilla ; op, opercular ; p, pineal foramen ; pa, parietal : 

 preopercular ; ptf, postfrontal ; pto, pterotic ; s, supra- 

 l, supraclavicle ; sop, subopercular ; v.gr, ventral gular. 



slightly modified.) c, clavicle ; d, cleit 

 gular ; m.s, median snpratemporal ; wix, 

 pf, prefrontal ; pm, premaxilla ; po, pi 



St. 



pmx 



FIG. 251. 



Restored head of Holoptychius Andersoni, Ag. ch, cheek-plates (= preopercular ? ) ; cl, clei th- 

 rum ; dv, clavicle ; d, dentary ; e, mesethmoid ; /, frontal ; g, paired ventral gular ; iop, inter- 

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

 premaxilla ; pt, post-temporal ; pto, pterotic ; sop, suboperculum ; sp, notch, possibly indicat- 

 ing spiracle ; st, supratemporal. 



