12 
and downwards from the anterior and upper borders, sometimes disappearing, 
sometimes fusing as they converge and approach the postero-inferior margin, 
which is nearly or quite smooth. 
General Form. — Like many examples of the genus Elonichthys, which 
comprises stout-bodied fishes with large fins, the type specimen of E. armatus 
is much distorted. As proved by the position of a remnant of the lateral 
line, it also lacks part of the dorsal border ; while the hinder portion of the 
caudal region is broken away. It seems probable, however, that the length 
of the head with opercular apparatus about equalled the maximum depth of 
the trunk, which must have been less than one-third of the length from the 
pectoral arch to the base of the caudal tin. 
Head . — The fragmentary remains of the rather stout liead-bones are 
exposed chiefly from beneath, and there are the bases of longitudinal rows of 
small teeth in an indeterminable position. Part of the series of branchiostegal 
rays (hr.) of the right side is also seen. 
Appendicular Skeleton. — One of the large pectoral fins {pet.), broken 
away only at the base, is spread upon the rock and exhibits not less than 
thirty rays, which are closely articulated throughout the length preserved, 
and arc finelv divided distallv. Part of the anterior border of the fin still 
retains some of the small fulcra, with which it was originally fringed. One 
of the pelvic fins ( plv .) is more satisfactorily shown, and is scarcely, if at all, 
inferior in size to the pectoral fin. The length of its base-line is considerably 
less than that of its longest fin-ray ; and its anterior border is fringed with 
well-preserved small, slender fulcra. All its rays are closely articulated to 
the base and finely divided distallv, while some obscure impressions of their 
outer face prove that they bore a coarse ornament of oblique ridges. A few 
of the anterior rays gradually increase in length, successively terminating at 
the gently curved anterior border. The anal fin {an.) is larger than the 
pelvic fins, but otherwise is closely similar to the latter. 
Squamation. — The scales are much fractured, and some of them are 
displaced in the fossil, while most of them are shown only in impressions of 
the outer face. In the abdominal region the principal scales of the flank 
(Fig. la) are somewhat deeper than broad, and one series of these slightly 
deepened scales is traversed by the large canal of the lateral line (Fig. 1, l). 
The scales at the ventral border are broader than deep, but not excessively so. 
The overlapped margin of each scale is moderately wide, and the hinder edge 
