2606 Bulletin 47, United States National Museum. 



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



of lower jaw uniserial; 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 (in L. exilis) 11 + 34 45. 



LYOPSETTA, 1016. 



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

 flesh firm; vertebrae (in E. jordani) 11 + 32 = 43. 



EOPSETTA, 1017. 



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

 brae (in H. platessoides) 13 + 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, some of them 

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

 vertebrae (in P. melanostictus) 11 + 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. 



VERASPER, 1020. 



jj. Teeth all uniserial ; gill rakers slender. HIPPOGLOSSINA, 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. XYSTKEUEYS, 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. PARALICHTHYS, 1024. 



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



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

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

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

 dal peduncle short; left ventral produced; vertebrae (in A. 

 quadrocellata) 9 -f 26 = 35. 



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

 of contiguous scales; dorsal lobe low; left ventral much 

 produced. KAMULARIA, 1025. 



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



n. Body broad, ovate, the depth more than $ length ; dorsal 

 lobe and left ventral moderately produced. 



ANCYLOPSETTA, 1026. 



nn. Body elliptical, the depth not more than 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. GASTROPSETTA, 1028 



