422 WELLBU1?\ : FISH FAUNA OF THE LOWER COAL MEASURES. 
Notes on the Fish-remains Found. 
With the exception of a few specimens kindly lent me by 
Mr. Magson, of Hollingworth, near Littleborough, to whom I am 
also indebted for the above table of strata, the following notes 
are based on specimens in my own collection, many of which 
have been seen by Dr. H. H. Traquair, F.R.S., &c., who, besides 
kindly naming many, also confirmed the identity of others which 
I had already named. 
kSub-class : Elasmobranchii. 
Order A. : Fchthyotomi. 
Family : Pleuracanthidae. 
Genus I. : Pjeuracantlius. 
8}). P. (Orthacanthus) cylindricLLS Agassiz. 
One spine from Littleborough (Lower Foot Mine) T refer to 
this species. 
The spine is small, round, smooth, nearly straight, and 
7-~) mui. in length, the diameter at the base being 5 mm. and 
at the apex 2 mm. The anterior surface is shown, the posterior 
denticulated surface being embedded in the matrix. The extreme 
tip is absent, but is shown in impression. The surface is 
destitute of ganoine but smooth, except at the distal end, where 
it is faintly striated, probably from slight wearing or erosion. 
The inserted portion is w^ell shown. 
Genus II. : Biplodm. 
8p. D. Gihhosus Agassiz. 
Teeth from both districts. See PL LXI., fig. 3. 
Order B. : Selachii. 
Sub-order 1. : Tectospondyli. 
Family : Petalodontidse. 
Genus I. : Callopristodus Traquair, 1888. 
Sp. C. pectinatus Agassiz sp. 
One tooth from the Lower Foot Mine, Littleborough, I refer 
with some hesitation to this species as, although the crown is 
well shown, the chare.cteristic root is absent. 
