54 
PISCES THORACICI. PLEURONECTES. 
PLEURONECTES. 
GENERIC CHARACTER. 
Caput parvum; oculi spkerici, ambo in eodem 
latere capitis. Os arcuatum, maxilla 
dent at a, inaquales. Operculum tribus 
laminis (in plurimisj constans. Mem- 
brana branchiostega radiis iv.—vii. Anus 
capiti profiior. 
Corpus compressum, carinatum, altero latere 
sub-convexo, dorsum; alteropiano, palli- 
diore, abdomen. 
The head small; the eyes spherical and 
both on the same side of the head; the 
mouth arched ; jaws unequal; set with 
teeth. The operculum usually of three 
laminae. The branchial membrane from 
iv. to vii. rays. The anus nearer the 
head than the tail. 
The body compressed, carinate; one side 
somewhat convex, answering to the 
back; the other flat, and of a paler 
colour, to the belly. 
No. LXIX. 
Pleuronectes oculis dextris ; ore magno, ascendente; dentibus sparsis , a cutis: corpore ovali, 
glabro ; cauda in medio parum production. 
The Pleuronectes with eyes on the right side; a wide ascending mouth; sharp teeth, 
scattered; a smooth, oval body; the caudal fin projecting a little at the middle. 
Called by the Natives Adalah. 
B. vii. D. 52. P. 14. V. 6. A. 39. C. 18. 
The body oval, much compressed ; scales small, orbicular, imbricate, tenacious. 
The bead small, compressed, sharp; the rostrum without scales. The mouth large, ascending obliquely ; the 
jaws long, straight, extractile; the teeth of unequal size, not in a close row, long, sharp, a little curve. The 
tongue short, roundish, emarginate, smooth at the point, rough towards the root. The palate set with small 
teeth. The eyes on the right side, large, globular, prominent, both on a line, one close to the vertex, the 
other near the posterior edge of the mouth. The nostrils small, round, one before the other, on a line with 
the superior edge of the orbit. The branchial opercula consist of two laminae, the posterior pointed; the 
branchial membrane of seven rays. 
The trunk. The back and belly carinate, the sides compressed, very little convex; the upper or right side 
(which is common to this genus) dusky, the opposite side white. The tail flat. The lateral line rising from 
the top of the posterior operculum, after inclining by a gentle bend, runs straight along the middle of the tail. 
The anus is situated near the ventral fins in the carina of the belly. 
The fins. The dorsal rising an inch and a half from the rostrum, is continued to within the same distance 
of the caudal fin ; the anal nearly of the same length, terminates exactly opposite: the rays of both incline 
