no. 2082. FLOUNDERS AND SOLES FROM JAPAN— HUBBS. 461 



Length of head, 0.19 of total length to base of caudal; depth, 0.31; 

 dorsal, 109; anal, 90. 



Head blunt and very short; elevation of upper profile at occiput 

 abrupt; ventral outline of head evenly curved; the posterior angle 

 of mandible not very prominent; diameter of upper eye, 0.05, equal 

 in size to lower eye and slightly posterior to it; the eyes separated 

 by a high naked ridge rising abruptly on preorbital at middle of an- 

 terior margin of lower orbit, extending backward and upward poste- 

 rior to the upper orbit; nostrils closely approximated, the anterior 

 lower than the posterior, with a short, fleshy, pointed flap, the posterior 

 small, not tubular, and without flap; snout from upper orbit about 

 as long as diameter of upper eye; a rectangular figure formed by 

 the anterior margins of orbits, the outline of snout, and the premax- 

 illaries; mouth very small and nearly vertical, the maxillaries reach- 

 ing only to the vertical of the anterior margin of the lower eye; bones 

 of eyed side nearly straight; those of blind side strongly curved; 

 maxillary of eyed side not quite as long as snout; the region poste- 

 rior to lower orbit deeply grooved; interorbital ridge very promi- 

 nent; preopercular ridge prominent, curved to form a slight but reg- 

 ular arch, preopercle extended backward at angle, so that the pos- 

 terior edge forms a semicircular arch; no spines or tubercles on 

 head; teeth small and sharp, but little compressed antero-posteriorly, 

 forming a single very even series confined entirely to the blind side 

 of the jaws, not even extended to symphysis; gill-rakers rudimen- 

 tary, about 6 of 7 papillae on lower limb of arch, none on upper limb. 



Body very thin and very elongate-ovate, the greatest width only 

 about 0.1 of depth. Dorsal outline more curved than ventral. Depth 

 of caudal peduncle, 0.08. The body cavity extended only one-ninth 

 the distance from the pectoral to the caudal base. Anus nearly on 

 ventral ridge. 



Scales cycloid, small, deciduous; 102 along the lateral line. Lat- 

 eral line present on eyed side only, with a high, short, and angulated 

 arch above pectoral; its length 0.10, its height 0.06; posterior to the 

 arch the lateral line is straight and exactly median in position, ex- 

 tended on middle caudal ray. Head scaly, except on interorbital, 

 snout and jaws; fins naked, excepting a few scattered scales on the 

 base of dorsal, anal, and caudal. 



Origin of dorsal slightly in advance of anterior margin of upper orbit, 

 the first two rays separate, the fin high to posterior end, the highest ray, 

 0.13, the last ray about 0.07. Caudal subsessile, length, 0.18. Anal 

 similar to dorsal, the posterior rays crowded; anal spine absent. 

 Ventrals each of six rays. Pectorals very small, pointed, length of 

 pectoral of eyed side, 0.06, blind side, 0.05. 



Color in alcohol, flesh-colored. Pectorals and ventral of blind side 

 colorless, other fins dusky. 



