PLEURONECTIN^ 285 



0. Supratemporal branch of lateral line, if present, without 

 posterior prolongation. 

 * Vertebrae 35 to 44 ; dorsal less than 90, anal less than 70 ; 

 intestine nearly entirely contained within body-cavity of 

 blind side. 

 t Postocular ridge sometimes rugose or with one or two 

 protuberances, never broken up into a series of promi- 

 nences ; lower pharyngeals narrow and rather slender, 

 4J to 7 times as long as broad, their inner edges evenly 

 curved and scarcely approximated, the teeth sharply 

 or obtusely conical. 

 J Lateral line with more or less distinct curve above 

 pectoral; scales adherent ; when ctenoid, the spinules 

 rather short and usually not numerous ; eye-balls 

 not scaled. 

 § Teeth obtusely conical, lanceolate or with truncated 

 tips, usually not much compressed, never forming 

 a continuous cutting edge ; at least 6 teeth on 

 ocular side of each jaw ; intestine of moderate 

 length, not very narrow, generally with 2 or 3 

 coils ; caudal with 11 or 12 branched rays 



17. LiMANDA. 



§§ Teeth incisor-like, compressed, sometimes forming a 



more or less continuous cutting edge ; less than 5 



teeth on ocular side of each jaw ; intestine elongate, 



narrow, with 3 or more coils ; caudal with 13 or 14 



branched rays . . .18. Pseudopleuronectes. 



II Lateral hne rising a httle above pectoral, but without 



distinct curve ; .scales thin, rather deciduous, those of 



ocular side ctenoid, the spinules slender and numerous ; 



upper surfaces of eye-balls scaled ; teeth obtusely 



conical ...... ig. De.xistes. 



ft Post-ocular ridge broken up into a series of 4 to 7 bony 

 prominences ; lower pharyngeals broader, stout, 2} to 

 nearly 5 times as long as broad, their inner edges more 

 or less approximated anteriorly, each with about 2 rows 

 of obtusely pointed or molariform teeth ; lateral line 

 with very low curve above pectoral ; scales mostly 

 cycloid and embedded in the skin . 20. Pleuronectes. 



** Vertebra; 48 to 65 ; dorsal 80-120, anal 65-102 ; second loop 

 of intestine elongate, extending well into secondary body- 

 cavity of ocular side, 

 ■f Teeth almost entirely confined to blind side, never more 

 than 3 on ocular side of each jaw ; lips thick ; 2 or 3 -i- i 

 pyloric appendages ; dorsal origin not far behind posterior 

 nostril of bhnd side ; fin-rays stout . . 21. Microstomus. 



tt Teeth fairly well developed on both sides, at least 7 on 

 ocular side of each jaw ; 2 to 4 -F 2 to 5 pyloric appen- 

 dages^ ; dorsal origin usually well behind posterior 

 nostril of blind side. 

 I Body ovate ; skin thick, the median fins densely scaled ; 

 lips thick : gill-opening scarcely extending above level 

 of axil of pectoral ; dorsal origin nearly diameter of 

 eye's length behind posterior nostril of blind side ; 

 fin-rays stout .... 22. Embassichthvs 



^ N'ot examined in Embassichthvs. 



