i68 
AMMONITES biplex. 
TAB. CCXCIII—Figs. 1 and 2. 
Spec. Cuar. Discoid; volutions exposed, costated ; 
costa numerous, small, split over the front : 
sides depressed, aperture oblong. 
EE 
V oxvrioxs five or six, the numerous costz are nearly 
straight, elevated and obtuse, a little before it passes 
over the front each is divided into two branches, equally 
thick with the undivided rib; the oblong aperture is 
narrowest near the front which is round; the external 
and internal surfaces do not differ. 
This Ammonite occurs in a mixture of Clay with 
Septaria and Clalk Boulders, that extends over a great 
part of Suffolk. Fig. 2 is from Barrow, given me by 
Mr. Barnes, of Norwich. 
