2G0S Bulletin ^7, United States National Musenm, 



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. "Vertebrne in increased number (varying from 13 + 3.5 = 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 GUj]}tocephalus.) 



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



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



Microstomas, 1040. 



II. Body stouter, the depth 2 to 2^ in length; vertebrfe more numerou.s, 



about 63. Embassichthys, 1041. 



Ik. Left side of skull with large mucous cavities; anal spine strong; vertebras 



58 to 65. Glyptocephalus, 1042. 



III.— PSETTINiE. 



(TuRBOT Tribe.) 



Lm'fie-moiilhed flounders, n'Uh the reniral fins nnsymmetrical. — Mouth sym- 

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

 wide (narrow in Plaioplirys, Eiropus, etc.), the maxillary commonly more 

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

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

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

 opercle free; ventral fins dissimilar in form or in*J)osition, 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 ; A^ertebra* in moderate or small number, 

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

 tribution. 



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



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



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



villifomi bands; l)ody broadly ovate; caudal fin subsessile ; interorbital area 



bro.ad; scales small, cycloid; gill rakers long and slender; anterior dorsal 



rays produced ; vertebric 36. Lophopsetta, 1043. 



hh. Vomer toothless ; ventral tins free from anal ; eaud.al fin subsessile. 



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

 fectly biserial. 

 rf. 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; vertebrjio (in P. Ivnatus) 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. Engyophbys, 1046. 



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



Trichopsetta, 1047. 



