502 



PISCES— FISHES. 



(c) Along the floor : basi-occipital, parasphenoid, vomers. _ 



(d) Around the ear on each side : sphenotic,_pterotic, and epiotic 



(above), prootic and opisthotic (beneath). 



(e) In front of and around the orbit : Parethmoid, lachrymal, 



orbilals. 



i 



Thus the haddock's skull shows in two respects an ad- 



.s.o. 



Pmy\ 



Fig. 216. — Disarticulated skull of cod.— From Edinburgh 

 Museum of Science and Art. 



S.O., Supra-occipital; Pa., parietal; Fr., frontal; M.E., meseth 

 moid ; N., nasal ; P.E., parethmoid ; Ot., otics ; E.O., ex-occi 

 pital ; B.O., basi-occipital ; Pa.S., parasphenoid ; F., vomer 

 L., lachrymal ; orb. t orbitals; H.M., hyomandibular ; S. 

 symplectic ; Q., quadrate; Pt., pterygoid; int.pt. , metaptery- 

 goid ; nts.pt., mesopterygoid ; PL, palatine; Mx., maxilla 

 Pjny., premaxilla ; Ar., articular ; An., angular ; D., dentary 

 ■u.h., urohyal ; h.h., hypohyal ; c.h., ceratohyal ; ep.k., epihyal 

 ih.y interhyal ; Op., opercular; S.op., sub-opercular ; i.op. 

 inter-opercular ; p.op., prae -opercular. 



vance upon that of the skate : first, in the ossification of the 

 primitive cartilage ; and second, in the addition of membrane 

 bones. Of the latter, the parietals and frontals cover over 

 the spaces which in the skate form the fontanelles. 



