13 
does not appear to have been serrated. The external ornament is remarkably 
uniform over all parts of the body, consisting of a few large, oblique ridges, 
which are described in the specific diagnosis. 
Affinities. — Elonichthys armalus is distinguished from the two known 
Australian species and from many other species by the absence of serrations 
on the scales. The peculiarly coarse scale-ornament also separates it from 
the remaining described forms. It seems to approach most nearly some of 
the Upper Carboniferous species. 
Elonichtuvs semilineatus, sp. nor. 
Plate IV, Fig. 1. 
Obs . — This species is known only by a few fragmentary specimens, of 
which three may be enumerated : — 
(a) Middle portion of small trunk, the type (PI. IY, Eigs. 1, la). 
(b) Distorted portion of larger trunk, with remains of the dorsal, anal, 
and pelvic fins. 
( c ) Greater portion of equally large trunk, somewhat distorted, showing 
only the dorsal fin. 
Sp. Char . — Probably attaining a length of about 0 35 m. Fin-rays 
very stout, and, some at least, ornamented with fine longitudinal ridges ; 
dorsal fin arising opposite the hinder end of the pelvic fins. Scales only 
moderately thick, and those of the middle of the flank in the abdominal 
region slightly deeper than broad ; posterior serrations very slight or absent. 
Scale ornament consisting in the lower part of fine horizontal lines coinciding 
with the concentric lines of growth ; in the antero-superior area of a few 
broad ridges, separated by narrow grooves, directed obliquely downwards and 
backwards, and passing behind into finer, more numerous, oblique ridges. 
General Form . — Not clearly determinable, but probably much the 
same as that of E. armalus. 
Read . — Too imperfectly known for description. 
Appendicular Skeleton . — The pelvic, dorsal, and anal fins are shown 
to have been fringed with small, slender fulcra, and the articulations of the 
stout fin-rays are moderately distant, so that the pieces between them are 
slightly longer than broad. There are also occasional traces of fine 
