161 



AMMONITES Humphriesiauus. 



TAB. D,—Jig. 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, 

 oblons:. 



C/OMPOSED 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. 



