VOL. XX. ( 3 ) 
THE LIASSIC ROCKS OF ENGLAND 
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his Nautilus inornatus, but that species has less inflated whorls, 
a more convex peripheral area, and the septa have a much 
deeper sinus on the lateral area. 
Horizon and Locality. — Mr. Richardson’s specimen is from 
the Pliensbachian ( valdani or " striati ” hemera), Webb’s Pit 1 
(or the Battledown Brick Works), Cheltenham. Both the British 
Museum specimens are from Lias of Kilsby Tunnel , 2 
Northamptonshire. 
1 For description of the pit see L. Richardson, A Handbook to the Geology of Cheltenham and 
Neighbourhood, 1904, p. 45. 
2 Both " Ammonites ” Ibex (belonging to the valdani hemera) and “ Ammonites ” Henleyi 
(belonging to the striati hemera) are stated by H. B. Woodward (Mem. Geol. Survey U. K., Jurassic 
Rocks of Britain, vol. iii., “ The Lias of England and Wales (Yorkshire excepted),” 1893, p. 166) 
to have been recorded from this tunnel. 
