GASTEROPODA. 69 



Paludina media, Woodward. Crag Moll., vol. i, p. 110, Tab. XII, fig. 1. 



Paludina media, S. Woodward. Geol. of Norfolk, pi. iii, figs. 5 and 6. 



— — S. P. Woodward. In Gunn's article on Geology of Norfolk in. 



White's Hist, and Directory of Norfolk 

 Sheffield, 1864. 



Locality. Fluvio-marine Crag, Bramerton and Thorpe. 



The Paludina from Bramerton and Thorpe described in ' Crag Molhisca,' vol. i, 

 p. 110, Tab. XII, fig. 16, was referred to P. lenta and P. unicolor, but which in vol. ii I 

 changed to P. parilis. This Fluvio-marine shell of Bramerton I now think ought to 

 have been called P. media, the name the late Dr. S. P. Woodward restored to it, and 

 from his so doing I presume he also considered it a distinct species. This name was 

 rejected by myself because there were two shells figured by S. Woodward, sen., in the 

 ' Geology of Norfolk,' called media and rotmidata, and I did not know which was to be 

 considered the type. 



Paludina Clactonensis, S. Wood. Supplement, Tab. I, fig. 4. a. b. 



Locality. Post-glacial, Clacton. 



The specimens figured were obtained at Clacton, by the Rev. 0. Fisher. They were 

 found by him in the marly portion of the deposit at that locality, in association with 

 Corbicula Jluminalis, and where I have also found some estuarine species Mytilus edulis, 

 Scrobicularia plana, and Tellina Balthica} Under these circumstances the peculiar 

 thickened and somewhat angular form which it possesses, like glacialis, suggests the idea 

 whether both it and glacialis are not distortions of some known species of Paludina, due 

 to their living either in salt or brackish water. I have, however, given it provisionally 

 the specific name of Clactonensis. 



A shell from the diluvium at Templehof, near Berlin, called P. diluviana, Kunth 

 (' Zeitschrift f. Geolog. Geschellschaft,' Berlin, 1865, Tab. VII, fig. 8), very much 

 resembles Clactonensis, and may be identical with it. 



Paludina contecta, Millet. Supplement, Tab. I, fig. 6. 



Cyclostoma contectum, Millet. Mollusca of Maine-et-Loire, 1813, p. 5. 

 Paludina Listeri, Forbes and Hartley. Brit. Moll., vol. iii, p. 8, pi. lxxi, fig. 16. 



Locality. Pre-glacial Forest Formation, Woman Hythe, Runton. 



The above figure represents a shell from the purely freshwater deposit at Woman 



1 These three marine species may very possibly, however, not belong to the Post-glacial deposit at all, 

 but be modern shells washed into it ; the deposit where these shells occurred being on the present beach. 



