PLATE VII. 



Figs. 



1,2. Ammonites hwnphriesianus, J. de C. Sowerby, Min. Conch., vol. v, p. 161, 

 1825, PI. D, fig. 1. [Brit. Mus. nos. 43908 a, b.] 



" Specific Characters. — Discoid, thick, radiated, inner whorls exposed ; front 

 rounded, radii large, numerous, rising into a tubercle on each side of the whorl, 

 where they branch into three ; aperture arched, oblong. 



" Composed of about four or five whorls, which are almost wholly exposed, 

 more especially the outer ones ; the radii are straight, gradually rising towards a 

 conical tubercle, 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 separates the turns ; the inner whorls have a much flatter front than the 

 outer, whence their sections are quadrangular, whilst the aperture of a large shell 

 is almost lunate. 



" 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 Inferior Oolite: the larger one is only a polished half. The same 

 species occurs abundantly at Bayeux in Normandy of a brighter colour." 



Fig. 



3. Ammonites brodiaei, J. Sowerby; front view of specimen. Brit. Mus. no. 



