113, PLEURONECTID^ ACHIRUS. 
841 
1298. M. sessaBicamla Goode. 
Ashy brown, with darker brown spots; blind side white; pectoral 
blackish, with traces of darker transverse bands. Body thin, its thick- 
ness not greater than the diameter of the eye ; depth 7.^ times the diame- 
ter of the eye; head everywhere closely thatched with scales even to 
the edges of the lips. Vertical fins mostly scaly. Lateral line on left 
side arched, its direction peculiar, the curve having two angles; lateral 
line on blind side nearly straight. Dorsal beginning on the snout, 
highest posteriorly, its longest rays half the head ; anal beginning close 
to the vent. Caudal rounded. Pectoral three-fourths length of head. 
Ventrals on the median line, equal. Head 5; depth 2|. D. 99 to 103; 
A. 79 to 84; scales 23-92-25, 20 in the anterior curve. L. G inches. 
Gulf Stream, off Newport, Ehode Island. {Goode.) 
(Goode, Proc. U. S. Nat. Mus. 1880, :?38.) 
464.— ACIISKUS Lacepede. 
Soles. 
(Lac^p^de, Hist. Nat. des Poiss. iv, 6.59, 1802: type Pleuronectes achirus L. = dchirus 
fasciatm 'Li&c. Pleuronectes lineatiis L.) 
Eyes and color on the right side. Body oblong, bluntly rounded 
anteriorly. Head small ; eyes small, close together, the upper eye in 
advance of the lower; mouth small, somewhat turned toward the colored 
side; nasal flaps present, the nostril of the blind side fringed; lip of the 
colored side fringed; teeth i^ery small, on blind side ouly ; gill-openings 
narrow; the branchiostegal region scaled. Head closel}' scaled every- 
where, the scales on the colored side similar to those on the body, those 
of the nape and chin much enlarged; scales on the blind side anteriorly, 
have their pectinations more or less produced, forming cirri ; scales of 
both sides extremely rough, extending on the fins. Lateral line straight, 
simple; edge of preopercle covered by the scales. Dorsal beginning- 
on the snout, low in front and thickly scaled, its rays divided; anal fin 
similar, without spine; caudal fin free, convex; caudal peduncle very 
short and deep; jiectoral fin of left side wanting, that of right side 
small or obsolete; ventral rays 3 or 4, the ventral fin of the colored side 
long, connected with the anal by a membrane, without hands; 
i. d., without pectoral fins.) 
a. Pectoral fius both obsolete. (Achirus.) 
1299. A. IsBBoatMS (L.) Ciiv. 
Olive brown, usually with about 6 narrow vertical black cross-lines 
usually not broader than puifil and with numerous black sjiots and 
