CEPHALOPODA. 91 



Ammonites, sp. ?. 

 (Plate L, fig. 8.) 



A fragment in the collection of Mr J. F. Walker, M.A., of 

 Sidney Sussex College. It was a simple round-backed Ammonite 

 with very numerous ribs (30 to 1 inch). Diam. of whorl fth inch. 

 I have not been able to identify this species, and it is too imperfect 

 for further working. 



Locality. Up ware (Coll. Mr J. F. Walker, M.A., F.G.S.). 



ANCYLOCERAS HILLSII, Sowerby, sp. 



(Plate II.) 

 Scaphites Hillsii, Sowerby, Geol Trans, iv., p. 339, pi. xv., f. 1, 2. 



Only one specimen of this species is known from Upware 

 (Woodw. Mus.). It is a fine shell just so far advanced as to have 

 completed its Crioceroid stage of growth. The aperture here is 

 rounded and transversely oval, whereas the section of the inner 

 whorls and of the mature Ancyloceras part of the shell is nearly 

 square. The ribs become very faint over the last quarter-whorl of 

 our specimen. 



The species differs from A. gigas Sowerby in its whorls being 

 more rounded, and enlarging less rapidly; also in its more simple 

 rounded ribs in the Crioceroid stages. From Crioceras Asterianus 

 d'Orbigny (Terr. Cret. L, pi. 115, bis. f. 3, 4, 5) our shell differs in 

 its more distinct ribbing, by its whorls enlarging less rapidly, and 

 in the smaller dorso-ventral diameter of its aperture. 



Localities. Upware, Hythe, Lympne, Maidstone, Godalming(?). 



