466 WELLBURX : FISH FAUNA OF THE PENDLESIDE LIMESTONES. 
in a band of crushed limestone at Burnside and Thorpe Fell, Yorkshire, 
but unfortunately not in such a condition as to render the deter- 
mination of species at all certain. 
Family CESXRACiONxiDiE. 
Genus Orodus. 
Orodus elongatus Davis (ex Agassiz M.S.), 1883. 
Several teeth"*^ have occurred in the limestones at Crimsworth 
Dean, near Hebden Bridge, Yorkshire, and the writer has also found 
them in the limestones at Astbury, near Congleton, Cheshire. 
Family Acanthodid.e. 
GrENUS ACANTHODES. 
ACANTHODES sp. 
The writer has found specimens of Acanthodes in the limestones 
at Astbury, near Congleton, Cheshire, and also at Pule Hill, near 
Marsden, Yorkshire, but the state of preservation of the specimens 
was not such as to render the determination of species at all certain. 
Family Diplacanthid.^:. 
Genus Marsdenius gen. nov. 
Generic characters : — Body fusiform, laterally compressed. Fins, 
especially the caudal, well developed. Teeth in the form of broad 
based blunt cones, confluent at the base. Clavicular bones strongly 
developed. Fin spines robust, the pectoral one being much elongated, 
remaining ones broad, robust, and ornamented with well-marked 
longitudinal ridges ; two dorsal fin spines, the posterior being longer 
than the anterior. Several scutes, or free spines, on the ventral 
aspect. Scales minute. 
Note. — The writer has long had specimens of this genus in his 
cabinets, but a detailed description has only now been rendered 
possible by recent finds. The name is taken from the locality where 
the type was found, viz., Marsden, Y'orkshire. 
Type : Author's col. 
Locality : Pule Hill, near Marsden, Yorkshire. 
* Wellburn, op. cit. 
