161 
AMMONITES Humphriesianus. 
TAB. D .-fig- 1- 
Spec Char. Discoid, thick, radiated, inner whorls 
exposed ; front rounded, radii large, numerous, 
rising into a tubercle on each side the whorl, 
where they branch into three ; aperture arched, 
oblong. 
Composed of about 4 or 5 whorls, which are almost 
wholly exposed, more especially the outer ones ; the 
radii are straight, gradually rising towards a conical tu- 
bercle, which in the outer whorls occupies about the 
middle of each side, and is distant from the suture, but 
in the inner ones is placed close to the suture that sepa- 
rates the turns : the inner whorls have a much flatter 
front than the outer, whence their sections are quadran- 
gular, whilst the aperture of a large shell is almost lu- 
nate. 
The two specimens figured of this Ammonite are from 
the stock of Mr. George Humphries. They were marked 
Sherborne , and appear to come from the Ironshot or in- 
ferior Oolite : the larger one is only a polished half. The 
same species occurs abundantly at Bayeux in Normandy 
of a brighter colour. 
