Geol. Mag. 1897. 



Decade IV, Vol. IV, PI. VI, 



Acanthonautilus bispinosus, A. H, Foord. 

 Carboniferous Limestone: Clane, Co. Kildare, Ireland. 



a. Front view, showing spines and sutures. \ 3 ^^^^ gj^e. 



b. Side view, showing sutures and general outline. ) * 



