E Ammonites biplex Sowerby, 1821. 
CEPHALOPODA Ammonites biplex 
Sowerby, 1821. 
1821. — SoWErBY (James). The Mineral Conchology of Great Britain, 
Vol. III, p. 168, PI. CCXCIIT, figs 1 and 2. 
Original 
figures. 
1 and 2. — A. biplex. 
PALAEONTOLOGIA UNIVERSALIS. — 58 
