ACROLEPIS WILSONI. WS 
The scales, although not jumbled, are nevertheless not well shown, being much 
broken in the splitting of the large nodule in which the fish is contained, but it is clear 
that they were thick, not denticulated posteriorly, and with a broad overlapped anterior 
area. Wherever the sculpture of the exposed surface is visible, it agrees essentially with 
that on the scales of the first described specimen, so that there is no doubt as to specific 
identity. ‘The pectoral fin measures 4 inches in length; the ventral, which is not long- 
based, measures 24 inches at its anterior border, and, as in the previous specimen, its 
position lies nearer to the anal than to the pectoral. ‘The dorsal, triangular-acuminate 
with concave posterior border, has a base of 3 inches in length, which is also the length 
of its longest rays in front. Concerning the anal and the caudal nothing special need 
be said, 
There is also, in my private collection, a juvenile specimen which measures 
34 inches in length, without the head and the extremity of the upper lobe of the 
caudal fin, which are deficient. ‘Though the scales in this specimen are naturally 
very small and the markings few, yet their style is quite recognisable. Noteworthy 
points are the proportionally distant character of the transverse articulations of the fin-rays, 
and the difficulty in making out the presence of fulcra on the anterior margins, which 
points are, in my opinion, connected with the youth of the individual. The ventral fin 
is here also nearer in position to the anal than to the pectoral. 
Observations.—I originally referred this species to EVonichthys, adopting the specific 
name ortholepis on account of the want of denticulations along the posterior borders of 
the flank-scales, which fact alone, I confess, ought to have made me think of the genus 
Acrolepis. ‘he scale characters of Acrolepis are, however, so evident in the subsequently 
discovered larger specimen, that I had no hesitation in transferring the species to that 
genus, these characters being the great thickness of the scales and the breadth of their 
anterior covered area. 
Geological Position and Locality—As yet found only in the fish-beds of Lower 
Carboniferous age exposed in the banks of the River Esk at Glencartholm, Dumtfries- 
shire. 
4. Acrotupis Wisont, Zraquair. Plate XXV, figs. 12, 13. 
Acro.ePis WILsont, Traquair. Geol. Mag. [3], vol. v, 1888, p. 254. 
— A. S. Woodward. Cat. Foss. Fishes Brit. Mus., pt. ii, 1891, 
p- 507, pl. xv, fig. 3. 
Description.—Only scales are as yet known, which indicate a fish of considerable size. 
The exposed surface is rhombic, closely covered with small pits about 7; inch in diameter, 
which in the middle of the area are arranged somewhat irregularly, but above and 
below are disposed in three or four regular lines parallel with the upper and lower 
Ri 
