214 



FISHES 



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



mks ar 



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 ; hr.r, branchiostegal rays ; c, cranium ; c.h, cerato- 

 hyal ; cm; cireum-orbltal Ijones ; d, dentary ; d.eth, dermal niesethmoid ; ep.h, epi- 

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

 hym, hyomandibular ; i.up, inter-operculum ; j, jugal ; mfo, Meckel's cartilage; 

 inpg, mesopterygoid ; ont.pg, metapterygoid ; mx, maxilla ; n, nasal ; op, operculum ; 

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

 palatine ; ^.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'', second upper labial. (From W. K. Parker.) 



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

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



