228 PBOCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



71. Planoebis albus, Miill. 



Plentiful ia the Colne Valley ; it also occurs at Bushey Park, 



Ruislip, Willesden, Finchley, Ponders End, and many other localities. 



Var. Draparnaudi, Shep. Canal near Harrow (T. D. A. Cockerell). 



72. Planokbis glaber, Jeff. 



Recorded in the Conch. Soc.'s census. We are informed that it was 

 taken in a private pond at Tottenham by Chas. Ashford in 1885. 



73. Planoebis crista (L.). 



Harefield, TJxbridge, Staines, Alperton, Ealing, Acton, and Stanmore. 

 It is also recorded for Twyford (S. C. Cockerell, S.G., 1887, p. 43). 



74. Planoebis caeinatus, Miill. 



Harefield, TJxbridge, Longford, Lower Halliford, Bedfont, Brent 

 near Hendon, Perivale, Edgware, East Finchley, Stanmore, Enfield, 

 and Ponders End. 



It is also recorded for Neasden and Wembley (C. C. Fryer, S.Gr., 

 1889, p. 259), and the Lea at Tottenham (Canon Horsley, S.G., n.s., vi, 

 p. 181). We have a fine scalariforni specimen from a pond at Edgware. 



75. Planoebis umbilicatus, Miill. 



Very generally distributed in ditches and streams all over the 

 county. 



76. Planoebis voetex (L.). 



Common and widely distributed in ponds and ditches. We have 

 several distorted specimens from a small pond at Finchley. 



77. Planoebis spieoebis (L.). 



TJxbridge, Perivale, Hendon, Finchley, Hampstead, Hackne}-, and 

 Lea Marshes. It is a local species, though plentiful where it does 

 occur. 



Var. alhida, Kelson. Finchley Common. 



78. Planoebis contoetus (L.). 



Found in all parts of the county, both in running and in stagnant 

 water. 



79. Planoebis fontanus (Lightf.). 

 Harefield, TJxbridge Marsh, jS'orthwood, West Drayton, near Coln- 

 brook, Stanmore, Acton, Hendon, Finchlej', and Wood Green. Other 

 records are: Hampstead (C. C. Fryer, S.Gr., 1889, p. 259); Enfield 

 (S. C. Cockerell, S.G., 1883, p. 9). 



80. Segmentina nitida (Miill.). 

 Yiewsley, Chertsey, pond near Shepperton, ditch at Ponders End. 

 It is a local species. It is also recorded for Fulham (T. D. A. 

 Cockerell, S.G., 1884, p. 236). 



81. Physa fontinalis (L.). 

 Widely distributed, and common in most of the streams and rivers. 



