PLEUROXECTHLE. — LXXXIX. 165 



hh. Lateral line straightish; scales thin, deciduous. 

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



ClTHAKICHTHYS, 232. 



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



Etkopcs, 233. 

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

 symmetrical ; eyes on right side. (Plattssirue.) 

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

 k. 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 Pseudopleukonectes, 235. 



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



ish in $ ; lower pharyngeals very large, partly united, 



with blunt teeth in 5 or 6 rows. . . . Liopsetta. 2 36. 



;}". Vertebra? 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. 



Itlyptocephaixs, 237. 



(,(!, 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. (Soltina.) 



o. Gill openings moderate, confluent below: vertical tins separate; 



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



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



wanting Achibus, 238. 



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

 scales Ctenoid; vertical fins confluent. (Cynoglossirue.) 

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

 head without fringes Symphukus, 239. 



226. PLATYSOMATICHTHYS Bleeker. (Reinhardtius Gill.) 



(nXaTvt, flat ; crania, body; IxBvs. fish.) 



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

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

 Cod, X. 



227. HIPPOGLOSSTJS Cuvier. (Old name from tmros, horse 



yXoxrcra, tongue.) 



461. H. hippoglossus (L.). HALIBUT. Dark brown; e; 

 large, widely separated. Head 3f ; 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 lhs. (Eu.) 



228. HIPPOGLOSSOIDES Gottsche. 



462. H. platessoides (Fabrieius). Rough Dab. Plain red- : 

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



