FAMILY PLANID^E PLATESSA. 299 



** EYES AND COLORED .SURFACE OX THE LEFT. 



THE OBLONG FLOUNDER. 



Platessa oblonga. 

 PLATE XLVill. FIO. LVi. 

 The Spotted Flo'imkr, P. ohhiigus. MiTCHii.L, Ti:ins. L It. and Plul. Sac. N. Y. Vol. I, p. :iyi. 



Characteristics. Oblong. Soioolh. Nearly uniform brown ; occasionally with spots. Cauda! 

 fin angulated. Lenglli fifteen to twenty inches. 



Description. Oblong. Length of the liead to the total length as one to four and a half. 

 Scales small, orbicular, and deeply imbedded ; they extend far up on the caudal fin. Late- 

 ral line straight from the tail, until it reaches near the tip of the peclural, when it suddenly 

 rises, curving convexly above it, and then proceeds with a gently concave curve to the upper 

 angle of the branchial aperture. Nostrils double ; the posterior and superior placed imme- 

 diately in front of the dorsal fin. Lower jaw prominent; its symphisis deep and truncate. 

 Eight to ten sharp stout teeth on each side of the lower jaw ; six to eight similar teeth on each 

 side of the upper jaw, and the remaining posterior portion of the jaw filled up with numerous 

 minute teeth. Tongue smooth. Stout hooked teeth on the pharyngeals. The branchial 

 meinbrane united in the centre, and strengthened by two bones forming the letter V. 



All the rays of the pectoral and caudal iins branched ; those of the remaining fins simple. 

 The dorsal fin commences anterior to the upper eye, and its anterior rays are doubled over and 

 free. This would assimilate it to the Rhombus, but the dorsal and anal do not approach un- 

 usually near the caudal fin. The same feature is noticeable in the anal fin, the anterior rays 

 of which arise almost immediately behind the venlrals, with the vent on the uncolored side. 

 Caudal fin with its central and external rays longest, producing an angular margin ; its rays 

 remarkably stout and ramose. 



Color. Dark olive-green, with somewhat lighter spots on the head and bod^r ; these spots 

 are occasionally distinct, but oflener witli no vestige of them. Dorsal, anal and caudal 

 dusky, tinged with sanguineous. The pectoral and ventral of the under side reddish ; above 

 dark olive with dusky bars. Branchial membrane bright olive above. The lower parts while, 

 with a faint blush of pink. Interior of the mouth rosaceous. Pu]nls black ; irides yellow. 



Length, 19-0. Depth, s-O. 



Fin rays, D. 88; P. 12; V. G; A. GG ; C. 17. 



This species is occasionally larger, but its average size is usually smaller than those dimen- 

 sions. Although the radial formula does not precisely coincide with the lisli of .Mitrliili, wliich 

 I have cited as a synonime, yet from the extreme difficulty of being accurate in the cmimera- 

 tion oi the rays, I can scarcely doubt its identity with his species. For the purpose of intro- 

 ducing uniformity into our English nomenclature, I have called the dextral species Flat-fish, 

 and shall restrict the name of Flounder to the sinistral species of this division. 



