PLEUEONECTID^. — LXXXIX. 165 



Jih. Lateral line straightish ; scales thin, deciduous. 

 i. Mouth moderate, the maxillary more than J head. i 



CiTHAEICHTHYS, 232. 



ii. Mouth very small, the teeth equal, the maxillary not J head. 



Etkopus, 233. 

 Vb. Mouth unsymmetrieal, the teeth chiefly on the blind side; V. nearly 

 symmetrical; eyes on right side. (Platessince.) 

 J. Tertebrae in moderate number (36 to ii); D. 65 to 80; A. 45 to 60. 

 h. Teeth in one row; lateral line not branched. 



I. Lateral line with an arch in front; scales ctenoid. 



LlMAHDA, 234. 



II. Lateral line without arch; teeth incisor-like. 



m. Scales regularly imbricate, all on eyed side ctenoid, in both 

 sexes; lower pharyngeals very narrow, with slender teeth, 



in two rows Pseudopleueobectes, 235. 



mm. Scales imperfectly imbricate, rough — ctenoid in cf , smooth- 



ish in $ ; lower pharyngeals T/ery large, partly united, 



with blunt teeth in 5 or 6 rows. . . . Liopsetta, 236. 



jj. Vertebrae in increased number (58 to 65); D. 100 or more ; A. 70 to 



100; teeth broad; left side of skull with large mucous cavities; 



anal spine strong ; body elongate, compressed. 



Glyptocephalus, 237. 



aa. Soles: edge of preopercle obscured by the scales; mouth very small, 



strongly twisted towards blind side; teeth rudimentary. 



n. Ej-es on right side, separated by a bony ridge. (Soleince.) 



0. Gill openings moderate, confluent below; vertical fins separate; 



right V. confluent with A.; vertebrse 28; body ovate; scales 



ctenoid, those on head enlarged and fringed; P. minute or 



wanting Achieus, 238. 



nn. Eyes on left side, very small, without distinct ridge between them; 

 scales ctenoid; vertical fins confluent. (Cynoglossince.) 

 p. V. of eyed side only present, free from A.; no P.; no lateral line; 

 head without fringes Symphukus, 239. 



226. PLATYSOMATICHTHYS Bleeker. (Reinhardtius Gill.) 



(TrXarur, flat ; traifia, body; IxSiis, fish.) 



460. P. hippoglossoides (Walbaum). Geeenlaxd Halibut. 

 Brown. Head 4 ; depth 3. D. 100. A. 75. L. 4 or more. Cape 

 Cod, N. 



227. HIPPOG-LOSSUS Cuvier. (Old name from InTros, horse ; 



yXiixTCTa, tongue.) 



461. H. hippoglossus (L.). Halibut. Dark brown; eyes 

 large, widely separated. Head 3|; depth 3. D. 105. A. 78. 

 L. 6 feet or more. In all northern seas, the largest and most val- 

 uable of the flat-fishes, reaching 400 lbs. {Eu.) 



228. HIPPOGLOSSOIDES Gottsche. 



462. H. platessoides (Fabricius). Rough Dab. Plain red- 

 dish brown ; eyes large ; teeth uniserial. Head 3| ; depth 2\. D. 



