294 



POLYPTERINI 



also present. The quadrate is only loosely connected with the 

 hyoid arch, and bears the articulation for the lower jaw (Figs. 266-7). 



mx 



Fio. 266. 



Skull of Polypterus Irichir, Geoffr. A, dorsal, and C, lateral view. (Modified from J. Miiller 

 and Allis.) B, ventral view, without the lower jaw. an, adnasal ; ang, angular ; bocc, basi- 

 occipital ; d, dentary ; e, mesethmoid ; ecpt, ectopterygoid ; ept, endopterygoid ; /, frontal ; 

 <7, paired gular ; gop, suboperculnm ; hy, hyomandibular ; m, maxilla ; ?i, nasal ; o, opisthotic ; 

 op, opercnlar; orb, orbit; p, labial cartilage (dotted); pa, parietal ; par, parasphenoid ; pm, 

 premaxilla ; po, postorbital ; pop, preopercular ; pt, post-temporal ; quad, quadrate ; sop, sub- 

 operculum ; sp, spiracle ; spo, spiracular plate ; st, supratemporal ; ro, vomer. A dotted line 

 indicates the coi rse of the lateral-line canal. 



The palato-pterygoid bar is, in fact, chiefly connected to the skull 

 by the palatine and long pterygoid articulation. The hyomandibular 



