306 



APPENDIX. 



f The references in this list are made to the ' History of British Mollusca,' by Messrs. Forbes and Hanley, except where 

 otherwise particularly expressed. 



(a) Tab. XXXI, fig. 22, is the representation of a monstrous form of this species. A small fracture, in infancy, has caused 

 the angle of volution to he slightly altered, by which the shell became elongated. At the upper corner of the aperture on the 

 body whorl is a small tooth or calcareous deposit, forming a sort of excurrent canal, an accidental character produced probably 

 by its abnormal form, as I have never seen the like in any existing specimen. This was found at Cherry Hinton Jiy the Rev. 

 Osmond Fisher, in what appears, he says, the site of an old moor or fen. With it were several other shells, H. ericetorum, 

 Limncea, Planorbis, Succinea, &c. From the same locality Mr. Fisher kindly forwarded to me, with the above, the fragment of 

 Cardium edule. He says, " I suppose this to have been brought by a sea-gull, or to have accidentally been dropped on the spot 

 by some extraneous means." This fragment does not look as if it belonged to a recent specimen, and I am inclined to believe it 

 to be a genuine fossil of the locality. Estuary or tidal conditions might have prevailed over the Bedford Level as high as 

 Cambridge, by the sinking of the eastern coast only a few feet, such as we may fairly assume to have been the case when 

 the Inland Cliff at Lowestoff, for example, was washed by the sea ; and although the deposits at Littleport and Cherry Hinton 

 are probably very modern, the introduction here of these shells as fossils is upon the assumption that they belong to an ante- 

 human period. 



(b) This is in a list of Pleistocene shells in my possession as from Faversham, but upon whose authority I do not now know. 



(c) From Cherry Hinton and Bostol. 



(d) H. conoidea, Sowerby, figured in the ' Mag. Nat. Hist.,' vol. vii, p. 429. pi. 2, figs. 4, 5, to accompany Mr. Brown's 

 Paper on the Clacton Fossils. I have not been able to see this specimen ; but, judging from the figure, it does not appear to be 

 anything more than a variety of H. hispida. This species, when frequenting marshy places, does assume an elevated form. 



The asterisks denote the presence of the species. 



