904.] 



<JS 'KoliOOY OF OIVDPEOri) KISIIKS. 



451 



(JircmtwrhiUd HerldH (toxt-li<;-. I I'.)). The total iiinnbcr of 

 •cii'cuirioi'hitiil bones on each side is nine ; the largest is that 

 whi(!h lies antero-ventrally to the eye. The nasal is very small. 



Mm- llkiry Series {tQxt-k^. 119). — Both premaxilla and ina-xilla 

 hound the gape above. Tliey })oth bear long, pointed teeth, and 

 the anterior tooth of the prenia,xillai'y series is much lai-ger tlian 

 the others. As already noti(;ed by Valenciennes (Hist. Nat. 

 Poiss, xix. 1846, pp. 150, 152, iuid 154), the j)remaxillii, is firmly 

 attached to the maxilla in CJuroceidrviS, wliereas in (Jlapea it is 

 readily mova})le upon the maxilla,. 'I'he two maxillie meet one 

 unothei- in fi-ont of tl)e mesethmoid, behind !Uid above the 

 prema-xillary sympliysis. 'I'liere arc; two sunmixilhe. 



Text-fiii'. 119. 



ar 



pop iop mpl 



Cluroccntrus durab, right side of skull. For explaniitiou oIlotttTiiif? see )). 493. 



Mmulihulm' Series (text-figs. 119 and 120, p. 452). — The de)itaiy 

 bears eight or ten large, curved, pointed teetli, foui- or five of which 

 are fii'mly anchylosed to tlie bone*. The angular is distin(;t, and 

 there is a very small sesamoid ai'ticidnr ; the endosteal articular 

 is not distinct from the ecjtosteal ai-ticidiir. 



JTyo'palati'ite Series (text-fig. 120, p. 452).- — The hyopahitine ;uvh 

 is shoi't !i,nd deep'. Thc^ hyomandibulai- has a single broa.d h(!a,<l for 

 articulation witli tlie crajiium. The inetapterygoid exttiiids In'gli 

 up the outer face of tlie hyoma,n(libuln,r, and' the sympl(((;tic is 

 small and lies nearly in a line with the axis of tlie hyomandibidar. 

 The symplectic, when viewed from ths buccal aspect, is largely 

 (not entirely) hidden by a downgrowth of the hyomandibulai-, 



* Smith Woodward (Brit. Mus. Cat. Foss. Fishes, iv. p. 88) says of Chirocentrus : 



" Teeth firmly fixed in shallow sockets." He mentions, however, ])ut one 



extinct species of Chirocentrus (C. jpolyodon), and states that it is " doubtfully of 

 this genus." 



29* 



