44Q 



TE LEO ST EI 



or girdle, no epipleurals, and no parapophyses. The teeth when present 

 are fused into plates in which vertical succession takes place (Figs. 451, 

 453). The basis cranii is simple ; the interoperculum rod-like and con- 

 cealed ; the suture between the dentarv and articular remains, also a 



Inner view of i ight half of pectoral girdle with pectoral fin of (A), Diodon pit nctidatus, Kp. ; 

 and (B). BalisU - verrucosus, L. cl, cleithrum : cor, coracoid : pel, postclavicle : ptr, radial : a . 

 scapula; scl, supraclavicle. (After Regan, Proc. Zool. Soc.) 



mx. 



Fig. 403. 



.skull and jaws of DicotylicMhys punctulatus, Kaup. ag, artgular ; ar, articular; d, dentary : 

 //-, frontal ; hm, hyomandibular ; iop, interopercular ; mp, mesopterygoid : mt, metapterygoid : 

 mx, maxilla; op, opercular; pmt, premaxilla; pop, preopercular ; prf, prefrontal ; pt, pterygoid ; 

 V'ft postfrontal ; pto, pterotic : q, quadrate ; sop, subopercular ; ly, symplectic. 



separate angular. The spines of the anterior vertebrae are bifid. The 

 supraclavicle is usually oblique (Fig. 452, A). 



A. In which the crushing beak is very massive, the skull is broadened, 

 and the hyopalatine arch very firmly fixed or fused to the skull, the 

 palatine being generally continuous with the vomer (Fig. 453). The 

 gills are reduced to three in number, and one branchiostegal is much 



