PALiEONISCIDiE. 
461 
P. 3447 a, b, P. 4333. A much-crushed specimen wanting the end 
of the tail, portions of head and abdominal region, in 
counterpart, and two imperfect examples of the caudal 
region : Deep-mine Ironstone Shale, Longton. 
Enniskillen Coll. 
36899. Imperfect head displaying some of the teeth, and a few 
anterior flank-scales ; Longton. Purchased , 1862. 
39918. Imperfect small individual displaying some of the branehio- 
stegal rays ; Longton. Purchased , 1866. 
Cycloptychius concentricus, Traquair. 
1881. Cycloptychius concentricus , R. H. Traquair, Trans. Roy. Soc. 
Edinb. vol. xxx. p. 37, pi. ii. figs. 17-20. 
Type. Eishes; Geological Survey of Scotland. 
Form and proportions as in the type species; facial bones and 
opercular apparatus striated, the mandible being slender and taper- 
ing, with a narrow band of tuberculations along its upper margin, 
and the striae below arranged diagonally. Scales ornamented with 
few large rounded ridges parallel with the anterior, inferior, and 
posterior borders ; principal scales of flank slightly more than one 
and a half times as deep as broad, with much rounded postero- 
inferior angle; scales near dorsal margin almost equilateral, with 
only one or two concentric ridges, the inner area being marked with 
few short diagonal ridges. 
Form. Loc. Calciferous Sandstones (Cement-stone Group): 
Eskdale, Dumfriesshire. 
P. 4083. Somewhat elongated individual, in counterpart, showing 
all the fins. Purchased , 1883. 
P. 4064-66. Three more imperfectly preserved specimens, the first 
in counterpart, and all displaying parts of the squamation. 
Purchased , 1883. 
Genus RHADINICHTHYS, Traquair. 
[Quart. Journ. Geol. Soc. vol. xxxiii. 1877, p. 559.] 
Trunk elegantly fusiform, more or less elongated. Mandibular 
suspensorium very oblique • teeth in two series, a small outer row 
and larger, incurved, conical laniaries, well spaced, within. Eins 
