214 



FISHES 



ossified to form the articular, which has a deeply concave surface 



mks 



FIG. 123. A, view of the left side of the skull of a Salmon ; B, the left half of the primary 

 upper and lower jaws, and the hyoid arch. The cartilage is dotted, an, Angular ; 

 ar, articular ; b.hy, basi-hyal ; br.r, branchiostegal rays ; c, cranium ; c.h, cerato- 

 hyal ; c.or, circum-orbital bones ; d, dentary ; d.eth, dermal mesethmoid ; eji.h, epi- 

 hyal ; ep.o, epiotic ; eth.p, ethmo-palatine process ; /, frontal ; h.hy, hypo-hyal ; 

 hym, hyomandibular ; i.op, inter-operculum ; j, jugal ; mks, Meckel's cartilage ; 

 mpg, mesopterygoid ; mt.pg, metapterygoid ; mx, maxilla ; n, nasal ; op, operculum ; 

 op', condyle on the hyomandibular for the operculum ; orb, orbit ; p, parietal ; pa, 

 palatine ; p.mx, premaxilla ; p.op, pre-operculum ; pt, pterygoid ; pt.o, pterotic ; 

 q, quadrate ; so, supra-occipital ; s.op, suboperculum ; sp.o, sphenotic ; s.t, supra- 

 temporal (or squamosal) ; st.hy, stylo-hyal ; sy, symplectic ; u.l.c, u.l.c', upper 

 labial cartilages ; u.l.c 2 , second upper labial. (From W. K. Parker. ) 



for articulation with the quadrate ; and below this there is a small 

 membrane bone, the angular. The rest of the cartilage is partially 



