OF ILFORD, ESSEX. 215 



distribution of the British Post-Glacial Mammals," ' mentioned 

 that this species and Eulota fruticiini occurred at Ilford. Thinking 

 that it was possible that examples might be in the Jeffreys 

 Collection now (alas!) in Washington, we wrote to Mr. W. H. 

 Dall, who kindly informed us that there are no specimens in that 

 collection. The species is of course now extinct in this country, 

 and is only known fossil from Barnwell, Copford, and Clacton. 



By far the most interesting specimen in Mr. Hinton's 

 collection is a single example of Limncsa glabra. At the present 

 time it is a widely distributed, though local, form in these 

 islands, but it has hitherto been unknown and unrecorded 

 (unfortunately we have had painful experience that the two 

 terms are not always synonymous) either from the Pleistocene 

 or Holocene. It was, of course, unlikely that so widespread a 

 form could be a recent introduction, and this example enables us 

 to fill up a gap in the geological record. 



All the examples we have seen of Covhicula flnminalis from 

 the Cauliflower Pit are immature, thus differing from the fine 

 examples found at Uphall. 



Vitrea nitidnla is an interesting addition to the Ilford fauna. 

 Though an abundant form at the present time, and common in 

 many Holocene beds, it is only known from the Pleistocene of 

 Barnwell, N.E. London, and Copford. 



An example of the dwarfed form of Limno'a palustvis, which 

 occurs in the Pleistocene of Harwich and Crayford, is in Mr. 

 Hinton's collection. 



Mr. Johnston and Mr. White have recorded Sp/uri'iiim 

 iiio'iiauuvi, Kobelt, from Uphall. This form is in our opinion not 

 entitled to rank as a distinct species, but should be considered a 

 variety of Sphcrvium covucuui (Linn.'), which is well known to all 

 conchologists as a polymorphic form, and it is possible to arrange 

 a gradating series from typical covncnui to typical mauaiium. We 

 would take this opportunity of thanking Mr. Hinton, Mr. 

 Johnson, and Mr. White, whose continuous work in the field has 

 been the means of greatly extending our knowledge of the 

 Pleistocene Non- Marine Mollusca. 



3 Quart. Jour. Gepl. Soc, vol. xxv., p. 192. 



