5TECJES OF riSIDIUM. 105 



CAMBRIDGESHIRE. CB. 



Barnwell [A. 8. K. & B. B. W.] [B.M. L. 326]. 

 ESSEX, NORTH. NE. 



Olacton [A. S. K. & B. B. W.]. 

 ESSKX, SOUTH. SE. 



Grays [A. S. K. & B. B. W.] [B.M. L. 6695, 7030 & 7932 j 



[M. P. G.]; llford [B.M. L. (5700 pars}. 

 KENT, WEST. WK. 



Crayford & Erith [A. S. "K. & B. B. W.] [B.M. L. 18609, 



19G64jxir*] [M. P. G.] ; Swanscombe [A. S. K. & B. B. W.]. 



Ml UPLESKX. MX. 



Brentford [B.M. L. 7^37 pars] ; Ponder's End (Glacial) 

 [A. S. K.] ; Twickenham [B.M. L. 9539J. 

 STKFOLK, EAST. ES. 



St. Cross, S. Elmham [M. P. G.] ; Stutton [A. S. K.]. 



WORCESTERSHIRE. WO. 



Birlingham, near Pershore [A. S. K.] ; Brieklehampton, near 

 Pershore [A. S. K.] ; Cropthorne [M. P. G.] [A. S. K.]. 



CROMEIUAX. 



No K FOLK, EAST. EN. 



West llunton [A. S. K. & B. B. W.] [X. M.] pi. P. G.]. 



PLIOCENE. 



NORFOLK, EAST. EN. 



Bramerton Common [N. M.]. 



Abroad the species occurs in Scandinavia, France, Germany 

 [from Bremen in Norman Coll.: B.M. 98.5.20: 22170-83 ^,r6- ; 

 22371-77 pars; 22161-65], Russia [Lindholm Coll.J and probably, 

 as Clessin says (35, p. 12), Europe generally north of the Alps. 

 It has been received under another name from Lake Baikal 

 (60 fath.). 



As a fossil it is met -with in the Holocene and Pleistocene of 

 Denmark [Johansen (85, p. 9)] ; in the Pleistocene (Canipinien) of 

 Courtrai, Belgium [Mus. Hist. Nat. Brussels] ; and in the Pleisto- 

 cene (Mosbacher Sand) of Hohensachsen and Pilgerhaus (near 

 Weinheim-an-der-Bergstrasse) [Wiist Coll.], and of Mauer (near 

 Heidelberg) [Geyer (65, p. 96)]. 



12. Pisidium parvulum, Clcssfn. 



[Pis. IT, f. 6 ; IV, f. 8 ; XXVII, f. 3-6.] 



1873. Pisidium parmlum, Clessin : in Westerlund, Fauna Moll. Svec. 

 Norv. et Uam'se, p. 553. [non P. parvulum, Benson MS.] 



This, which is the smallest of the species dealt with in the 

 present monograph, has not yet been met with in the British Isles, 

 either recent or fossil. 



