PLEURONECTID^. LXXXIX. 165 



Till. Lateral line straightish; scales thin, deciduous. 

 i. Mouth moderate, the maxillary more than head. 



ClTHARICHTHYS, 232. 



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



ETROPUS, 233. 

 bb. Mouth unsymmetrical, the teeth chiefly on the blind side; V. nearly 



symmetrical; eyes on right side. (Platessince.) 



j. Vertebra? in moderate number (36 to 44); D. 65 to 80; A. 45 to 60. 

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



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



LlMANDA, 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 PSEUDOPLEURONECTES, 235. 



mm. Scales imperfectly imbricate, rough ctenoid in <?, smooth- 



ish in <J> ; lower pharyngeals very 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. Eyes on right side, separated by a bony ridge. (Soleince.) 

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

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

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



wanting ACHIRUS, 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 SYMPHURUS, 239. 



226. PLATYSOMATICHTHYS Bleeker. (Reinhardtius Gill.) 



(TrXarvs, flat ; <r&yta, body ; ixOvs, fish.) 



460. P. hippoglossoides (Walbaum). GREENLAND HALIBUT. 

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

 Cod, N. 



227. HIPPOGLOSSUS Cuvier. (Old name from ITTJTOS, horse ; 



yXwo-o-a, 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 Ibs. (Eu.) 



228. HIPPOGLOSSOIDES Gottsche. 



462. H. platessoides (Fabricius). ROUGH DAB. Plain red- 

 dish brown ; eyes large ; teeth uniserial. Head 3f ; depth 2^. D. 



