SPF.CJES OF PISIDIUM. 105 



CAM BRTDG ESHIRE. CB. 



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

 ESSEX, NORTH. NE. 



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

 ESSEX, SOUTH. SE. 



Grays [A. S. K. & B. B. W.] [B.M. L. 6695, 7930 & 7932] 



[M. P. G.]; llford [B.M. L. 67UO^rs]. 

 KENT, WEST. WK. 



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



19664 pars] [M. P. G.] ; Swanscorube [A. S. K. & B. B. W.]. 

 MIDDLESEX MX. 



Brentford [B.M. L. 7637 pars'] ; Ponder'a End (Glacial) 



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

 SUFFOLK, EAST. ES. 



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



WoRC ESTERSHIRE. WO. 



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

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



CROMERIAN. 



NORFOLK, EAST. EN. 



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



PLIOCEXK. 



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: 221 70-83 pars; 

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

 as Clessin says (35, p. 12), Europe generally north o.t : 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 (Campinicn) of 

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

 cene (Mosbacher Sand) of Hohensachsen and Pilgerhaus (near 

 Weiuheim-an-der-Bergstrasse) [Wiist Coll.], and ol Mauer (near 

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



12. Pisidium parvulum, Clessin. 



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



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

 Norv. et Danise, p. 553. [non P. pan-uhon, 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. 



