CATALOGUE OF SPECIES OF PISIDIUM. 21 



DISTRIBUTION. 



si 

 01 



NS CA 

 HB SS 



RW RE EL BF AN 

 Wl El PN AS 

 AM PM FF Kl 

 1 DN SG PC KF 

 ' CT ' RF LL ED HO 



AY LA PE BW NN 

 WD ED LD AN WT KB DF SK RX SM 



FE TY AR DO CU WL NY DM 



WM SL LE MO IM ML MY EY 



EM RO CV LH SL WY SY LN 



WQ N6 LF WH ME CR DB FT CH DY NM LS 



SG KG KO DU MN MG SP ST LR B WN EN 



CL NT QC CW Wl CD RA HF WO WW NO HU WS $ 



NK LK ST KK WX PB CM BR QE OX B_X BD HJ NE 



SK MC EC WA GM MM GW NW BK MX SJ 



WC L NS SW NH s3w_K EK 



ND SS DT SJ WX EX 

 EC SO )W 



SO WC 



Cl 

 Pisidium amnicam. 



('Recent occurrences are shown in red : fossil occurrences by a line 

 IM -low the symbols. For the explanation of the symbols see p. 20.) 



RECENT. 



ENGLAND. 

 LONDON. H. 



Hattcreea [Gray Coll., IUI. 1912. 12. o : 1-20]. 

 BERKSHIRE. BK. [C. C. S.] 

 BUCKINGHAMSHIRE. BX. 



Eton (River Thames) [J. E. C.] : Dcnham [J. E. C.] ; Halt on 



Canal [J. E. C.] ; near Leighron Buzzard [J. E. C.]. 

 CAMBRIDGESHIRE. CB. 



Cnmbridge [Gray Coll., B.M. 1912. 12. o : 21-32 & 1912.12.13: 



01 -100, both as Peru henslowana']. 



