foMl'AU.VTIVi: STIDY OF SCOMliRüID FLSIIIX gQS 



lower jaw . Tliey ai« formed iu alveoles and are replaced l)y new ones comiug 

 out between tlie old. Tu the Scombridio the teeth uro very mmute. Indeed 

 tlie Japinese uaiue " saba " for the inackei-el raeaiis miuute teeth in our old 

 lai)}iHii4<e. The voiuerine teeth wheu present are an'anged iu two latei*al 

 pitches, aiid the palatiue teeth when present are iu one row only. In the 

 C\biida' the teetii are well dovelopsd, long, curved, laterally compressed, and 

 generally trenchant at the edges. Thus seerfishes are ^•oracious, and often hurt 

 fishermen and damage fishing apparatus too. Teeth on the vomer and 

 palatines ai'e villiform. In the Plecosfei the teeth iu jaws are small, couical 

 and cm-\ed. Iu the Thnnnidio villiform teeth are found on the vomer, 

 pilatines, and pterygoids. Mesopterygoid teeth iU'e remarkable, as the^' arj 

 not found in the other fishes. In the Katsuwonidro the teeth are foimd iu 

 Ixjth Jaws only ; but in the geuus Evlfajnims palatines and sometimes the 

 vomer too are tootheil. Iu these cjses the teeth are surauged iu one row 

 oul}-, and they iU'e rather large. 



The eyes are comparatively siuall iu the Cybiid», being contained more 

 than 7-10 times iu the length of the head, and more than 30-40 times iu 

 the total length of the bod>' ; but they are largo iu Gyimwmnhi. In the 

 Scombrida3 and Plecostei the eyes are large, being contained less than (J -10 

 times iu the head, and 18-27 times iu the lx)d3-. In the Sa)ml)rida) the 

 adipose eyelids are remai'kably well develox)ed. Iu the Cj'biidaj and Plecostei 

 the eyelids scarcelj' cover the ej'e-ball. T/nmnvs (jcrmo mid PamfJiunmts 

 melxichi have large ej'es, these tunnies descend to the deej)er strata of waters. 

 The eye-capsules are well develo^jed and more or less calcified in the Plecostei. 



Lateral Line. 



The lateral line more or less imdulates. Iu the Scombrid», however, the 

 uudulation is insignificant, l)eiug nearly straight fi'om the nape tj the caudal 

 lieduude, nmniug more f)r less parallel t) tlie dorsal median line o; the body, 

 and the perforated scalas in the line are only a little modified fi'om other 

 scales. In the Cybiida; the Lateral hue runs general!}' parallt\l to the doreal 

 mediau line of the liody for some distance from the nape, and at the caudiil 

 ]>ai't the lateral line nearly coincides with the lateral median line of the body. 

 These two jwrtious of the lateral line are connected bj' an obhque ^»rtion. 



