GASTEROPODA. 61 



a specimen from the same formation (at Sutton) of Ch.fuhocincta, Forb. and Hani., which 

 Mr. Jeffreys considers only as a variety of rufa ; the difference between these two consisting 

 in one having rather more convex volutions than the other. The figure in ' Crag Moll.' 

 has the costae rather too numerous, and they are not sufficiently erect. 



Chemnitzia rdgulosa, S. Wood. Supplement, Tab. IV, fig. 15. 



Locality. Red Crag, Walton Naze. Fluvio-marine Crag, Yarn Hill ? 



Two somewhat imperfect specimens, presumedly belonging to this genus, were found 

 by myself many years since, one of which is represented in the above figure. They were 

 not described in the ' Crag Mollusca,' in the hope that something more perfect or capable 

 of better determination might be discovered, but in this I have been disappointed. These 

 are unfortunately much rubbed and their true markings partially obliterated. The volu- 

 tions are convex on the lower part and flattened above, where there are some obsolete riblets, 

 and there is an indistinct fold upon an upright columella — the characteristic distinction of 

 this genus. The shell it most resembles is Ch. speciosa, dredged by Mr. McAndrew in Vigo 

 Bay, but I am not able to say they are the same. Mr. Crowfoot has recently sent me 

 two still more imperfect specimens from the Fluvio-marine deposit at Yarn Hill, which, I 

 think, may be referred to the same species. I have given the name provisionally. 



Chemnitzia plicatula? BroccM. Supplement, Tab. VII, fig. 3. 



Tukbo plicatulus, Broc. Conch. Foss. Sub-ap., vol. ii, p. 376, t. vii, fig. 5, 1814. 

 Turbonilla plicatula, Homes. Concli. Foss. Wien., vol. i, p. 503, tab. xliii, fig. 33, 



1856. 



Localities. Red Crag, Butley, Walton Naze {Bell). Chillesford Bed, Beccles 

 Waterworks. 



A single, but very imperfect specimen (the one figured from Butley) has been put 

 into my hands by Mr. A. Bell, to which the name above was attached. It is too imperfect 

 for diagnosis, and I have referred it as above, though with doubt. The fragment shows 

 about three fifths of what probably was its original size. The plications and ribs are 

 straight and numerous, and the volutions are nearly flat. It differs from the one I have 

 previously called rugulosa, in which the volutions are convex on the lower part. 



Mr. Crowfoot has recently sent to me two small fragments, which appear to belong to 

 the same species. These, he tells me, were obtained in sinking the Beccles Waterworks 

 well, which, it is to be presumed, pierced the same bed as that not far away at Aldeby, 

 though it has a Fluvio-marine aspect. All these fragments have had their surface more 

 or less decorticated or altered in some degree, and the above reference is not satisfactory. 



