The Mulln&ca of Cambridgeshire 



Huntingdon and \\Yst Suffolk, the bordering counties not 

 included in this table, do not po>srss any >pecies not found 

 also in Cambridgeshire. 



There are in the I'Ynland several shell-hearing deposits 

 more recent than the Pleistocene Gravels and representing 

 the period when the land to the east and north of Cambridge 

 was still covered by brackish and tidal waters, dotted with 

 more or less isolated patches of dry land, of which the 

 Isle of Ely as it then was formed one of the largest. In the 

 formation known as I'Yn silt there occur shells of Mytilus 

 edutit, Os/m/ ('(/tt/ffi, Cardium edule and Scrobicularia j>l<m<(. 

 The last-named is so frequent in one bed as to have obtained 

 for it the title "Scrobicularia Clay." /YW////y/ iininicnm also 

 occurs in the Fen silt, while another Fen deposit, the Shell 

 Marl of Burwell and other places, contains about 20 species of 

 non-marine Gasteropoda and about 5 of non-marine Pel 

 poda, all of which are living in the county at the present 

 time. Pulmlcxtrinu cciitnma, which is not known alive in the 

 county, occurs near Littleport in the Scrobicularia Cla\. 



The public collections of mollusca obtained from within 

 the county are those in the Samuel Smith and other 

 cabinets in the Wisbech Museum, the Cambridge Natural 

 History Society's County Type Collection in the University 

 Museum of Zoology, while the general and MacAndrew 

 Collections in the latter also contain many specimen^ from 

 the Cambridge neighbourhood. The Sedgwick Museum of 

 Geology has most of the species found in the local (1 ravels. 



In compiling this article the writer is indebted to 

 Mrs Mi-Kenny Hughes, the Rev. A. H. Cooke (King's 

 College), Head Master of Aldenham School, and Mr I- 1 . C. 

 Morgan, B.A. (Trinity College), for much information a 

 occurrences and localities, and also to Mr B. B. Wood- 

 ward, F.LS., of the British Museum, for most valuable 



i nomenclature, identifications and refeivnc. 

 the literature of the subject. 



