PLEURONECTIDA, — LXXXIX, 165 
hh. Lateral line straightish; scales thin, deciduous. 
z, Mouth moderate, the maxillary more than $ head. 
CITHARICHTHYS, 282. 
ii. Mouth very small, the teeth equal, the maxillary not } head. 
Errorvs, 233. 
bb. Mouth unsymmetrical, the teeth chiefly on the blind side; V. nearly 
symmetrical; eyes on right side. (Platessine.) 
j- Vertebre in moderate number (36 to 44); D. 65 to 80; A. 45 to 60. 
k. Teeth in one row lateral line not branched, 
Z, Lateral line In front; scales ctenoid. 
Liman, 234. 
Ul. Lateral lina eee 3 teeth incisor-like. ; 
m. Scales regularly imbricate, all on eyed side ctenoid, in both 
sexes; lower pharyngeals very narrow, with slender teeth, 
in tworows, . . . » « PSEUDOPLEURONECTES, 235. 
mm. Scales imperfectly imbricate, rough — ctenoid in ¢', smooth- 
ish in 9; lower pharyngeals very large, partly united, 
with blunt teeth in 5 or 6 rows.. . . LiopsErTa, 236. 
jj. Vertebr 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. (Soleine.) 
o. Gill openings moderate, confluent below; vertical fins separate; 
right V. confluent with A.; vertebra 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. ( Cynoglossine.) 
p. V. of eyed side only present, free from A.;ano P.; no lateral line; 
head without fringes. . . Bia en % SyMPuuRus, 239. 
226. PLATYSOMATICHTHYS Bleeker. (Reinhardtius Gill.) 
(mdaris, flat; capa, body; ix6us, fish.) 
460. P. hippoglossoides (Walbaum). GREENLAND Hatisur. 
Brown. Head 4; depth 3. D.100. A. 75. L. 4 or more. Cape 
Cod, N. os 
227. HIPPOGLOSSUS Cuvier. (Old name from imos, horse ; 
yhaooa, tongue.) 
Y 461. H. hippoglossus (L.). Haxinut. 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.) 
y 228. HIPPOGLOSSOIDES Gottsche. 
462. H. platessoides (Fabricius). Rovucu Das. Plain red- 
dish brown; eyes large; teeth uniserial. Head 33; depth 2}. D. 
' 
