PLEURONECTIDA. — LXXXIX. 165 
hh. Lateral line straightish; scales thin, deciduous. 
2. Mouth moderate, the maxillary more than } head. 
CITHARICHTHYS, 232. 
ii. Mouth very small, the teeth equal, the maxillary not 4 head. 
Erropus, 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. 
1, Lateral line with an arch in front; scales ctenoid. 
LIMANDA, 234. 
ll. 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 9; lower pharyngeals very large, partly united, 
with blunt teeth in 5 or 6 rows.. . . Liopserra, 236. 
jj. Vertebre 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.; vertebrae 28; body ovate; scales 
ctenoid, those on head enlarged and fringed; P. minute or 
WC ae a ne ie er a sits oe (ACHIRUS, 238. 
nn. Eyes on left side, very small, withane diatinee ridge between them; 
scales ctenoid ; ‘vertical fins confluent. ( Cynoglossine.) 
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.) 
(mdarvs, flat; capa, body; iydus, 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 imzos, horse ; 
yAoooa, tongue.) 
461. H. hippoglossus (L.). Harrsut. Dark brown; eyes 
large, widely separated. Head 33; 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). Rovucu Das. Plain red- 
dish brown; eyes large; teeth uniserial. Head 33; depth 24. D. 
