REPORT ON FOSSIL FISHES. 25 
parallel with the inferior margin. Passing towards the caudal region (fig. 11), the 
ridges become less divisible into two sets, and are generally tolerably parallel 
with the upper and lower margins of the scale; they exhibit, moreover, a 
tendency to reticulation or anastomosis, till finally, on the small lozenge-shaped 
scales of the caudal body-prolongation the pattern assumes more of a punc- 
tured than of a striated aspect. The denticulation of the hind margin of the 
body-scales is persistent up to the tail pedicle. A few strong, broad, imbricat- 
ing scales are seen in front of the dorsal fin, and the upper margin of the 
caudal body-prolongation is set with the usual median row of imbricating V 
scales, displaying a ridged ornamentation corresponding with that of the body 
scales. 
The dorsal fin commences midway between the head and the probable 
origin of the caudal, and is triangular and acuminate in shape, with the 
posterior margin excavated. Not less than thirty rays are contained in it, 
these being rather delicate. dichotomising towards their extremities, and 
divided by transverse articulations, which are somewhat distant. Externally 
the rays are ganoid, and finely striated in the direction of their length (fig. 12) ; 
the anterior margin of the fin is set with fine fulcra. None of the other fins 
are preserved. 
Remarks.—Elonichthys pulcherrimus evidently belongs to the same group 
of species as Elonichthys Egertoni of the British Coal Measures, and those 
originally described by Giese (Elonichthys Germari, &c.), but it is so distinct 
in its short deep form and its beautiful scale ornamentation as to render 
detailed comparison unnecessary. 
Position and Locality.—From the Cement-stone group of the Calciferous 
Sandstone series, near Glencartholm, Eskdale. 
Genus Rhadinichthys, Traquair, 1877. 
(Traquair, Quar. Journ. Geol. Soc. xxxiii. 1877, p, 558.) 
Rhadinichthys Geikiei, Traquair. 
Rhadinichthys Geikie’, Traquair, Proc. Roy. Soc. Edin. ix. 1877, p. 438. 
Pl. I. figs. 13-18. 
Description.—Length of a particularly fine and perfect specimen, 4+ inches ; 
less perfect examples, however, indicate that it often attained larger dimensions, 
and one in particular, judging from the size of the head, must have originally 
measured over 6 inches. The shape is elegantly fusiform and rather slender ; 
the length of the head being rather greater than the depth of the body at the 
ventral fins, and contained about 44 times in the total. 
The cranial roof bones are ornamented with closely set, well-defined 
