430 
Proceedings of the Royal Society 
Elonichthys (?) pedinatus, sp. nov. Traquair. 
Description. — Flank scales about ^ incb broad, and usually a 
little higher, exclusive of the articular spine ; moderately thick. 
Upper margin with prominent articular spine ; anterior covered 
area narrow ; exposed surface brilliantly ganoid, sculptured with 
oblique, sub-parallel, prominent ridges, occasionally branching, 
anastomising, and intercalated, and terminating behind in delicate 
denticulations of the posterior margin; about 7 or 8 of these ridges in 
the space of inch. Under surface of scale with feebly marked 
keel ; a narrow area along the posterior margin is obliquely grooved, 
the short grooves terminating between the denticulations of the 
margin, so as to produce a pectinated appearance. Scales from 
apparently the ventral aspect are lower than broad, and with more 
produced anterior-superior angles ; others, from their more regularly 
rhomboidal shape, and scanty development or absence of the 
articular spine, and more prominent keel of the attached surface, 
were probably situated more towards the caudal extremity. In all 
cases the external sculpture is similar, and the under surface dis- 
plays the same peculiar pectinated appearance at the posterior 
margin. 
Associated with these scales there is on a specimen from Carluke 
in the collection of Mr Grossart, of Salsburgh, a small fragment of 
the edge of what must have been a pretty large jaw. This frag- 
ment is nearly 1J inch in length, and displays the stumps of 5 stout 
conical teeth, with traces of smaller ones external to them ; the 
external surface of the bone is beautifully tuberculated. 
Remarks. — Though as yet I only know this species from detached 
and dislocated scales, often occurring together in masses, and, from 
the small jaw fragment described above, there can be no doubt as 
to its distinctness and novelty as a species. In external sculpture 
these scales bear a considerable resemblance to those of Acrolepis 
Rankinei (Gyrolepis Rankinei , Ag.), with which, on superficial 
examination, they might perhaps be confounded, but from the latter 
they may be at once distinguished by the narrowness of the anterior 
covered marginal area, and the grooved pectination of the posterior 
margin of the internal aspect. Of course, until further information 
regarding its fins and head be obtained there must be some uncer- 
