398 WELLBURN : FOSSIL FISH FOUND IN THE MILLSTONE GRITS. 
Sp. Strepsodus sp. ? 
Tooth: Loc, Wadsworth Moor. 
Order II. : Actinopterygii. 
Sub-order : Chondrostei. 
Family : Paloeoniscidai. 
Genus I. : Elonichthys Giebel, 1848. 
Sp. E. Aitkeni Traquair. 
Among the fossils described by Mr. Aitken, in the paper 
mentioned above, were the remains of a fish which he considered 
to belong to the genus Aa'olejns, the species being new. This 
fish has since been described by Dr. R. H. Traquair, F.R.S., ttc.,'^'* 
he referring it to the genus Elonicthys, giving it the specific 
designation Aitkeni, the species proving to be new. 
The remains of this fish found in the shale at AVad.sworth 
Moor, although fragmentary, were in a beautiful state of preser- 
vation. In one specimen the head is shown (with the exception 
of the end of the snout), and about the anterior third of the body. 
The head bones are beautifully preserved, and show the beautiful 
and characteristic ornamentation ("undulating ridges passing at 
times into elongated tubercules "—Traquair). On the right side 
are remains of a pectoral fin (" rays unarticulated for about one- 
third their length " — Traquair), and on the left are several small 
elongated plates (branchio-stegal rays), also two larger jDlates which 
are probably opercular. The scales are rhomboidal in shape and 
profusely sculptured, with "ridges and furrows traversing them 
almost parallel (with their long axis? — Aitken) ivith the superun- 
and inferior borders, and nearly in a line with the body of the fish ; 
the ridges having a tendency to bifurcate and not unfrequently 
further subdivide into two or three branches, these often converging 
and becoming re-united." This scale ornamentation corresponds 
to a great extent with that given by Dr. Traquair. 
Genus II.: Acroleins Agassiz. 
Sp. A. Hopkinsi McCoy. 
In the Woodwardian Museum, Cambridge, are five specimens 
of this fish from Wadsworth Moor. Mr. F. R. C. Reed, M.A., 
Geo. Mag., Dec. 3rd, Vol. III., No. 10, p. 444, 1886. 
