2608 Bulletin 47, United States National Museum. 



jjj. Scales all in both sexes and on both sides of the body 

 represented by coarse scattered stellate tubercles; 

 similar tubercles between bases of dorsal and anal 

 rays ; lateral line without scales ; lower pharyngeals 

 broad, each with 3 rows of blunt, coarse teeth; 

 teeth incisor -like. PLATICHTHYS, 1039. 



aa. Vertebrae in increased number (varying from 13 + 35 = 48 to 13 + 52 = 65); dorsal 

 rays 90 to 120 ; anal rays 70 to 100 ; teeth broad, incisor-like ; scales small, all 

 cycloid. (Genera allied to Glyptocephalus.) 

 k. Left side of skull normal; anal spine obsolete; vertebrae 48 to 52. 



I. Body elongate, the depth 2^ to 3 in length ; vertebrae 48 to 52. 



MlCROSTOMUS, 1040. 



II. Body stouter, the depth 2 to 2 in length; vertebrae more numerous, 



about 63. EMBASSICHTHYS, 1041. 



kk. Left side of skull with large mucous cavities; anal spine strong; vertebra) 



58 to 65. GLYPTOCEPHALUS, 1042. 



III. PSETTIN^l. 

 (TURBOT TRIBE.) 



Large-mouthed flounders, with the ventral fins unsymmetrical. Mouth sym- 

 metrical, the dentition nearly equally developed on both sides ; gape usually 

 wide (narrow in Platophrys, Etropm, etc.), the maxillary commonly more 

 than length of head ; lower pharyngeals narrow, each with one or more 

 rows or a narrow band of small, sharp teeth; teeth in jaws acute; eyes 

 not minute ; pectorals and ventrals usually well developed ; edge of pre- 

 opercle free; ventral fins dissimilar in form or in position, that of the left 

 or eyed side inserted on the ridge of the abdomen, its base extended along 

 this ridge, its rays more or less wide apart; caudal fin rounded or subtrun- 

 cate; no accessory lateral line; anal spine usually weak or obsolete; a 

 pelvic spine sometimes developed ; vertebrae in moderate or small number, 

 31 to 45. Body sinistral. Species chiefly tropical or subtropical in dis- 

 tribution. 



. Pectoral fin of both sides present; septum of gill cavity below gill arches without 



foramen ; a deep emargination near the isthmus ; ventral fins free from anal. 

 b. Vomer with teeth ; lateral line with a strong arch in front; teeth subequal, in 

 villiform bands ; body broadly ovate ; caudal fin subsessile ; interorbital area 

 broad; scales small, cycloid; gill rakers long and slender; anterior dorsal 

 rays produced ; vertebrae 36. LOPHOPSETTA, 1043. 



bb. Vomer toothless ; ventral tins free from anal ; caudal fin subsessile. 



c. Lateral line with a distinct arch in front; teeth small, uniserial, or imper- 

 fectly biserial. 

 d. Interorbital space more or less broad, deeply concave, at least in the 



males ; form broad ovate ; gill rakers short and thick. 

 e. Scales small, ctenoid, adherent, 75 to 100 or more ; anterior rays of 

 dorsal not elevated ; pectoral of left side usually filamentous 

 in the male ; vertebras (in P. lunatus) 9 + 30 = 39. 



PLATOPHRYS, 1044. 



ee. Scales moderate, 60 to 70; anterior rays of dorsal greatly pro- 

 duced ; no lateral line on blind side. PERISSIAS, 1045. 

 dd. Interorbital space a narrow ridge ; dorsal not elevated in front. 



/. Gill rakers obsolete ; interorbital area armed with a spine ; scales 

 rough. ENGYOPHHYS, 1046. 



ff. Gill rakers slender ; right ventral elongate ; scales ctenoid. 



TRICHOPSETTA, 1047. 



