200 PROCEEDINGS OF THE MALACOLOGICAL SOCIEXr. 



According to Sandberger,' V. glacialis is allied to V. pachya, Bourg., 

 from the Amoor.'^ 



31. YlVIPARA MEDIA (S. "Woodw.). 



Paludina media, S. Woodward : Outline of the Geology of jSTorfolk, 



1833, pi. iii, figs. 5, 6. 

 Paludina rotundata, S. Woodward : op. cit., pi. iii, fi^g. 7. 

 Paludina ohsoleta ?, S. Woodward : op. cit., pi. iii, fig. 4. 

 Paludina lenta, Brander : S. Y. Wood, Crag Moll., vol. i, p. 110, 



pi. xii, fig. 1. 

 Paludina parilis, S, V. Wood: Crag Moll., vol. ii, p. 320. 

 Paludina media, S. Woodw. : S. Y. Wood, Crag Moll., Suppt. I, p. 69. 

 Paludina unicolor, Oliv : G. von Frauenfeld, Yerh. k.k. Zool. Bot. Ges., 



1864, p. 153. 

 Paludina ?OT^a (Brander ?) : J. G. Jeffreys, Quart. Journ. Geol. Soc, 



vol. xxvii (1871), p. 493. 

 Paludina unicolor, Swainson : J. G. Jeffreys, Quart. Journ. Geol. Soc, 



vol. xxvi (1870), p. 282. 

 Paludina vivipara, Linn. : S. Y. Wood, Crag Moll., Suppt. I, p. 70, 



pi. i, fig. 5 {non Linn.). 



Form, and Loo. — Bed Crag : Waldringfield (A. Bell). IS'orwich Crag : 

 Bramerton Common ; Thorpe, Norfolk; Bulchamp ; Thorpe, Aldebui'gh ; 

 Dunwich; Yarn Hill ; Horstead?; Postwick (S. Woodward). 



Few shells in the Crag have caused more difference of opinion as to 

 their identification than this. There can be no doubt that Paludina 

 media and P. rotundata of S. Woodward are the same species, but it is 

 not so certain with regard to P. ohsoleta. The figure more resembles 

 Vivipara glacialis, but in any case it is not desirable to substitute for 

 the well-established name media that of ohsoleta, because the latter 

 is fig. 4 and the former fig. 5. There is probably an error as to the 

 locality of the specimen in the British Museum (Natural History) 

 labelled "Hasle worth." 



The immature example figured by Wood as Pahidina vivipara, 

 Linn., undoubtedly belongs to this species, as a careful comparison 

 shows. With regard to the locality of this specimen, too, a mistake 

 has probably been made. In the text it is stated that an example 

 of Paludina vivipara was found by Mr. Cavell at Easton Bavent, but 

 that the example figured is from the lower glacial beds at Eackheath ; 

 whilst in the explanation of the plate the figured specimen is said 

 to be from the Chillesford Beds, Horstead. The shell in the national 

 collection labelled as the figured specimen is marked as coming 

 from Horstead. Vivipara media is recorded with a query by 

 Dr. J. Lorie ^ from a boring at Gorkum, Holland, at a depth of 92 and 



^ C. L. F. Sandberger, " Beitrag zur Kenntniss der unterpleistocanen ScHchten 

 Englands" : Palseontographica, 1881, p. 8.5. 



2 J. Bourguignat, " Spicileges Malacol.," p. 9, pi. vii, figs. 1, 2. 



3 " Contrib. a la Geol. des Pays Bas " : Archives Musee Teyler., ser. ii, vol. ii, 



p. 163. 



