260G Bulletin ^7, United States National Miiseiun. 



e. Lateral line simple, without accessory dorsal branch ; teeth sharp, those 

 of lower jaw nniserial; dorsal beginning above eye. 

 /. Teeth in the upper jaw biserial. 



g. Scales comparatively large, thin, and deciduous; lateral line 70; 

 body slender, the flesh soft; vertebrae (iu L. exilis) 11 + 34 = 45. 



Lyopsetta, 1016. 

 gg. Scales small and adherent; lateral line 96; body robust, the 

 flesh firm; vertebrse (in E. jordani) 11 + 32 = 4:). 



EOPSKTTA, 1017. 

 ff. Teeth in the upper jaw uniserial; scales small and flesh firm; verte- 

 brae (in H. platessoides) 13 4- 32 =:45. Hippoglossoides, 1018. 

 ee. Lateral line with an accessory dorsal branch; scales .small, firm, ctenoid; 

 dorsal fin beginning before the eye ; teeth sharp, unequal, someof them 

 canine-like ; mouth not large ; lower pharyngeal teeth sharp, uniserial ; 

 vertebrae (in P. melanostictus) 11 -f 29 = 40. Psettichthys, 1019. 

 dd. Lateral line with an arch in front; no accessory branch ; vertebrae in smaller 

 number (35 to 41); anal spine usually obsolete; body normally sinistral. 

 (Species chiefly of the temperate or subtropical seas, none of them Arctic 

 and none European.) (Genera allied to Paralichthys.) 

 h. Dorsal fin beginning above the pupil; teeth rather small; no canines; 

 body indifferently dextral or sinistral (in some species at least). 

 i. Scales ctenoid. 



j. Teeth in upper jaw in 2 series ; gill rakers broad. 



Veraspee, 1020. 

 jj. Teeth all uniserial; gill rakers slender. Hippoglosslna, 1021. 

 ii. Scales cycloid ; teeth uniserial ; gill rakers short and thick. 



k. Teeth small, pointed, equal. Lioglossina, 1022. 



kk. Teeth unequal, blunt, conical; caudal fin subsessile, the cau- 

 dal peduncle extremely short ; skin of shoulder girdle with 

 patches of cup-shaped scales ; vertebrae (in X. liolepis) 12 + 

 25 = 37. Xystreueys, 1023. 



hh. Dorsal fin beginning in advance of eye ; teeth sharp, uniserial or smooth. 



I. Scales weakly ciliated; caudal fin with a distinct peduncle; mouth 



large; teeth unequal, some of the anterior canine like; gill 

 rakers rather long and slender; no dorsal lobe nor produced 

 ventral rays ; vertebrae 35 to 41. Paealichthys, 1024. 



II. Scales very strongly ctenoid on both sides of body ; mouth smallish, 



with small, sharp teeth; anterior rays of dorsal more or less 

 exserted, thus forming a more or less distinct lobe ; gill mem- 

 branes considerably united; gill rakers short and broad; cau- 

 dal peduncle short; left ventral i>roduced; vertebra? (in A. 

 quadrocellata) 9 + 26 r= 35. 

 tn. Lateral line with its tubes much branched, covering parts 

 of contiguous scales; dorsal lobe low; left ventral much 

 produced. Eamdlaria, 1025. 



mm. Lateral line with its tubes simple, not branched. 



n. Body broad, ovate, the deptli more than \ length ; dorsal 

 lobe and left ventral moderately produced. 



Ancylopsetta, 1026. 

 nn. Body elliptical, the depth not more than J length; dor- 

 sal lobe and left ventral greatly produced. 



Notosema, 1027. 



III. Scales entirely smooth ; caudal peduncle short; mouth small ; gill 



rakers short and thick ; dorsal with an anterior lobe ; left 

 ventral elongate. Gasteopsetta, 1028 



