SPECIES OF PISIDIUM. 99 



PLEISTOCENE. 



LONDON. 3L. 



Angel Road, Tottenham (Glacial) [A. S. K.J ; Hackney [B. B. W.] ; 



N.E. London [B.M. L. 5804- pars]; Shackle\vell Lane [Presfcwich 



Coll., B.M. L. 23973]. 

 BEDFORDSHIRE. BD. 



Biddenham [Prestwich Coll., B.M. L. 23960]; Kempfcon[B.M. 



L. 18611]. 

 CAMBRIDGESHIRE. CB. 



Barnwell [A. S. K.] [B.M. L. 5707 & 14932]. 

 ESSEX, NORTH. NE. 



Clacton [A. S. K. & B. B. W.] [B.M. L. 6686] [M. P. G.]. 

 ESSEX, SOUTH. SE. 



Grays [A. S. K. & B. B, W.] [B.M. L. 6695] ; Ilford [A. S. K.] 



[B.M. L. 6700 pars]. 

 HUNTINGDONSHIRE. HU. 



Woodstone [C. E. Y. K.J. 

 KENT, WEST. WK. 



Crayford-Erith [A. S. K. & B. B. W.] [B.M. -L. 6690 & 



19664-5 pars] [M. P. G.] ; Swanscombe [A. S. K. & B. B. W.J. 

 MIDDLESEX, MX. 



Brentford [B.M. L. 7637 pars]. 

 NORTHAMPTONSHIRE. NO. 



Overton Longville [Prestwich Coll., B.M. L. 23966]. 

 SUFFOLK, EAST. ES. 



Stutton [A. S. K.J. 

 WILTSHIRE, SOUTH. SW. 



Fisherton [B.M. L. 6716]. 

 WORCESTERSHIRE. WO. 



Bhiingham, near Pershore [A. S. K.]. 



CROMERIAN. 



NORFOLK, EAST. EN. 



Sidestrand [M. P. G.] ; Trimingham [M. P. G.] ; West Runton 



[A. S. K. & B. B. W.] [N. M.] [M. P. G.]. 



CORALLINE CRAG. 



SUFFOLK, EAST. ES. 



Sutton [R. Bell Coll., B.M. L. 7343]. 



P. henslowanum is known from Scandinavia [Lynge Coll.], 

 France and Germany [Norman Coll., B.M. 98.5.20: 22204-16 & 

 22221-2], Russia [Lindholm Coll.], and probably occurs throughout 

 Europe north of the Alps. A specimen was also obtained from 

 Lake Baikal [Lindholm Coll.]. 



As a fossil it is fouud in post-glacial deposits at Toppeladergard, 

 Sweden [Prof. G. E. Wright Coll.] ; in the Holoceue and Pleistocene 



