part 3] mollusca from the Cambridge (.ravels. 287 



The scries of mollusca obtained by Prof. Marr was kindly for- 

 warded to us, and we were able to identify thirteen species, 

 namely : — 



Hygromia hispida ( Linnr). .Six ex- 

 amples. 



Pivpilla muscorxvmiJAmxi). Abundant. 



( Columella columella (G. von Martens). 

 Two examples. 



Succinea cf. grcerilandica Beck. One 

 example. 



8. pfeifferi Rossmassler. Common. 



8. oblonga Draparnaud. Common. 



Limnaea perer/er (Midler). Common. 



Limnma palustris (M uller) . Five 

 examples. 



L. truncatula (Midler). Two examples. 



Planorbis wmoiUcatus (Midler). One 

 example. 



PI. leucostoma, Mdlet. One example. 



Valvata piscina-Its (Midler). Three- 

 examples. 



Pisidhnn amnicum (Midler), One 

 example. 



It is perhaps advisable to ignore the previous records not con- 

 tinued in the above list. 



The examples are not so dwarfed as those from the Arctic Beds 

 of the Lea Valley ; nevertheless, they clearly belong to that stage, 

 and indicate similar climatic conditions. 



Minor Deposits. 



Prof. Hughes recorded Corbicula fluminalis from the gravel 

 in the railway-cutting north of Shelford. 1 

 S. V. Wood 2 noted that 



• Mr. Harmer has found the freshwater shell Corbicula [Cyrena] flu/rmnaUs 

 in numbers in this gravel [March] associated with Gardium edulis [sic] and 

 other marine shells ; an association corresponding 1 to that which occurs in the 

 Hessle gravel at Kelsea Hill in Yorkshire.' 



S. H. Miller & S. P. .1. Skertchley again recorded this species 

 in is78, and added that it also occurred at Chatteris, Whittlesea, 

 and Xormanslandhirmev 1 There is another record of this species 

 from Chatteris 1 ; while Unto tumidus, Bithyiua tentaculata, 

 and Valvata piscinalis are cited from the March gravels. We 

 can confirm the record of Corbicula fluminalis from March, from 

 examples in our collection. Prof. Marr has called our attention 

 to the fact that an example of this species, obtained at Manea, 

 north-west of Ely, by the late Prof. Hughes, is in the Sedgwick 

 Museum. 



Notes on some of the Species. 



YlTKINA PELLUCIDA (Muller). 



The single example of this species was obtained from the interior 

 of a specimen of Ariamta atrbust&rwm (Linne), front Barnwell 

 Abbey. It is the oldest record for the species, for the examples 



1 "Gravels of East Anglia ' Cambridge, 1916, p. 46. 

 - ' Crag Mollusca ' 2nd Suppl., Pal. Soc. Monogr. 1879. p. 53. 

 3 ■ Fenland Past &. Present ' p. 539. 



1 " The Geology of South-West Norfolk & North Cambridgeshire ' (Sheet 

 05) Mem. Geol. Surv. 1893, p. 110. 



