PLEURONBCTIDJS. 
609 
palatine. Eyes generally on the right side. Both pairs of fins 
present, symmetrically developed ; dorsal fin arising above the eye ; 
caudal fin separate, rounded behind. Scales very small or 
absent. 
Hange at present throughout the temperate and arctic seas of 
the northern hemisphere. 
1 he following specimon appears to be identical with the corre- 
sponding bon i' of the existing Pleuronectes platessa, Linn.: — 
P- 8739. Left maxilla, described as referable to Platessa sp. by 
E. T. Newton, Vert. Forest Bed (Mem. Geol. Snrv. 1882), 
p. 128; Forest Bed, Overstrand, Norfolk. Savin Coll. 
An otolith described as follows, probably belongs to this genus, 
but is not represented in the Collection : — 
Otolithus (Platessa) sector , E. Koken, Zeitschr. deutsch. geol. Ges. 
vol. xl. (1888), p. 292, pi. xvii. figs. 14-16, and ibid. 
vol. xliii. (1891), p. 105, pi. i. fig. 4. — Lower Oligocene; 
Westeregeln and Osterweddingen, Germany. Also Lower 
Tertiary, Alabama. 
Genus SOLEA, Cuvier. 
[Regne Animal, vol. ii. 1817, p. 223.] 
Mouth small and unsymmetrical, twisted round to the left (blind) 
side ; teeth minute and villiform, confined to the left margin of the 
jaws. Eyes on the right side, the upper being more or less in 
advance of the lower. Abdominal vertebrae with very small trans- 
verse processes and rudimentary ribs, but most of them with long 
and robust haemapophyses. Both pairs of fins usually represented, 
Lut often unsymmetrical and one sometimes absent ; dorsal fin 
arising on the snout ; caudal fin separate, rounded behind. Scales 
Ver J’ small, antero-posteriorly elongated, deeply overlapping, and 
ctenoid. 
Existing species occur in all temperate and tropical seas, and a 
few inhabit freshwaters. 
Solea kirchbergana, Meyer. 
1848. Rhombus kirchberganus, H. von Meyer, Neues Jahrb. p. 782. 
1851. Solea kirchbergana, H. von Meyer, Paloeontogr. vol. ii. p. 102, 
pi. xvii. figs. 2, .3. 
18-56. Solea kirchbergana, IJ. von Meyer, ibid. vol. vi. p. 25, pi. i. fig. 3. 
1*83. Rhombus kirchberganus, F. A. Quenstedt, Ilandb. Petrefakt. 
ed. 3, j>. .370, pi. xxix. figs. 2, 3. 
PART IV. ■> K 
