WELLBURX : FISH FAUNA OF THE PEXDLESIDE LIMESTOXES. 469 
Marsdenius sp. 1 
The author has collected and seen specimens of this genus, but 
unfortunately not in such a condition as to render the determination 
of species at all certain, from the Pendleside Limestones of the following 
localities, viz.: — Pule Hill, Marsden, Yorkshire ; Dane Valley, Staffs, 
(half a mile above the bridge, and immediately below the Kinderscout 
bed of the Millstone Grits). 
Remarks : — The above specimens, in certain characters, appear 
to indicate that the species is new, but the writer deems it better 
to wait for more perfect specimens. 
Remarks on the genus Marsdenius : — From the foregoing re- 
marks it. will be seen that the conformation of the mandible and 
the character and arrangement of the teeth, and also that of the 
pectoral fin spines of Marsdenius is very similar to that of Acantho- 
dopsis Wardi Egerton of the Coal Measures, whereas, on the other 
hand, the general characters and arrangement of the fin spines as 
a whole, and the great and characteristic development. of the clavicular 
bones, also the scutes or ventral free spines, strongly ally the fish 
to many of the Diplacanthidae, and this being so the author has 
ventured to place the genus in that family. 
Family Rhizodontid/E. 
Genus Rhizodopsis Young, 18GG. 
Rhizodopsis sauroides Williamson, 1837. 
There are several fragmentary specimens of this fish in the 
collections of Mr. Barns, F.G.S., Higher Broughton, Manchester, 
and also in that of the author. 
Loc. : Pule Hill, Marsden, Yorkshire, 
Genus Strepsodus Young, 18GG. 
Strepsodus sauroides Binney sp., 1841. 
Fragmentary remains in the collections of Mr. Barns and the 
author. 
Loc: Pule Hill, Marsden, Yorkshire. 
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