NO. 1484. JAPANESE FLOUNDERS' AND SOLES— JORDAN & STARKS. IfiS 



z. Lateral line with an anterior arch; lower pharyngeal teeth biserial; vertebne 



(in H. hippoglomis) 16 + 84 = 50 IFippnglossus, 13 



zz. Lateral line nearly straight; lower pharyngeal teeth in one row. 



Reinhardtius, 14 



yy. Large teeth in both jaws arrow-shaped, biserial, some of them depressible; 



njjper eye with vertical range; gillrakers short; scales deciduous, ciliated; 



lateral line without arch; flesh soft. Vertebrae 12 + 37 =49..AthereKthes, 15 



III. Siilalainily PLKTlTROlSrECTIN'^'E. 

 PLAICE TRIBE. 



Mouth small, unsymmetrical, the jaws on the eyed side with nearly 

 strai^'ht outline, the bones on the blind side strong-ly curved; dentition 

 chiefly developed on the blind side; eyes large; edge of preopercle not 

 hidden by the scales; pectoral fins well developed; vertical fins well 

 separated; ventral fins nearly or quite symmetrical, that of the eyed 

 side not prolonged along the ridge of the abdomen; anal spine usually 

 strong (obsolete in Mic7'ostomus and Veraetpta). Body dextral (except 

 frequently in Plat)chtliiji< stellatus). Species arctic or suliarctic in 

 distribution. 



KEY TO GENERA. 



a. Vertebrte in moderate number (36 to 44) ; dorsal rays 65 to 80; anal rays 45 to 60. 

 b. Teeth in bands, small, acute; lower pharyngeals narrow, with small teeth, 

 usually two-rowed. 



c. Lateral line without branch, and with a broad arch in front; scales large, 



ctenoid, caducous; gillrakers short and sharp Ahvops, 16 



cc. Lateral line with an accessory dorsal branch, without arch in front; lips 



thick, folded; dorsal fin beginning on l)lind side ..Plenroulrftfhi/s, 17 



III). Teeth in a single row, usually bluntish or incisor-like. 



d. Lateral line with an accessory dorsal branch, and with a distinct arch in 



front; scales imbricated, firm, rough-ctenoid. Lepidopsetta, l^ 



dd. Lateral line without accessory branch. 



e. Lateral line with a semicircular arch in front. 

 /. Body robust ; anal spine present ; scales usually but not always 



ctenoid Lbnandu, 19 



ff. Body slender and fragile ; scales very small, cycloid ; no anal 



spine Yerxqiia, 20 



ee. Lateral line with(^ut arch in front. 

 h. Scales present. 

 i. Bases of vertical fins without stellate tubercles. 

 j. Scales regularly imbricate, all on eyed side, ctenoid in both sexes. 

 k. Scales large (60 to 65), loose, with slender spinules; interorbital 

 space narrow, naked; teeth not close-set. 



I. Eyeball scaly above Dexistcx, 21 



U. Eyeball scaleless Araias, 22 



jj. Scales imperfectly imbricated or else not ctenoid; teeth blunt, close- 

 set. 

 m. Scales chiefiy cycloid in both sexes; lower pharyngeals each with 



one row of small teeth Pleuronedey, 23 



7nm. Scales rough-ctenoid in the male, mostly cycloid in the female; 

 lower pharyngeals large, with 5 or 6 rows of large blunt, close- 

 set teeth Liopsettd, 24 



