OSTEOLEPIDOTI 



281 



' Restoration of Ghiptnpomiis. A, ventral, and Ji, dorsal view 01 tne ueau, jaiwu huaicjf, 

 .slightly modified.) c, clavicle ; ci, cleithrum ; e, ethmoid ; fr, frontal ; I, lower jaw ; l.g, lateral 

 gular ; m.s, median snpratemporal : mx, maxilla ; op, opercular ; p, pineal foramen ; pa, parietal ; 

 pf, prefrontal ; pro, premaxilla ; po, preopercular ; ptf, postfrontal ; pto, pterotic ; s, supra- 

 ".temporal ; scl, supraclavicle ; sop, subopercular ; v.g, ventral gular. 



LOp. g SOp 



Fig. 251. 



Restored head of Holoptychius Andersoni, Ag. eh , cheek-plates ( = preopercular ? ) ; d, cleith- 

 rum ; civ, clavicle; d, dentary ; e, mesethmoid ; /, frontal ; g, paired ventral gular; lop, 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. 



