W. D. ROEBUCK : LINCOLNSHIRE MOLLUSCA. 



269 



Sutton-on-the-Sea, in drift at high-water mark, a few juv. ! (B. S. Dodd, 

 December 1886). Sloothby, near Alford, one, very young, August 4th, 1886 ! 

 (J. E. Mason). Foss Dyke, Lincoln ! (W. Nelson). Gravel Drain, one,. 

 April 14th, 1883 ! (W. E. Clarke). Ditch alongside Black Bank Drain, one, 

 April 14th, 1883 ! (W. E. Clarke). 

 South Lincolnshire.— Crowland Wash, July 1886 ! (T. W. Bell). 



Limnsea palustris (Miill.). 

 Occurs in several North Lincolnshire localities, about Wrcot^ 

 Louth, and Sutton, and in two Southern localities, Anwick and 

 Crowland. 



North Lincolnshire. — Pond by Louth Canal, numerous, April 15th, 1886! also 

 a few in the canal close by ! (H. W. Kew and W. D.k.), Farlesthorpe, May 

 25th, 1887, a few, small (J. E. Mason). Sutton, one ! (H.W. Kew, 16, iv, 87). 

 Somercotes, two ! (H, W. Kew, 16, iv, 87). Ditches, Sampson's Lane, 

 common, April 14th, 1883 ! and one in a place impregnated with iron I 

 (VV.D.R.). Ditch alongside Black Bank Drain, a few, April 14th, 1883 I 

 (W.D.R.). 



South Lincolnshire. — Crowland Wash, July 1886 ! (T. W. Bell). Rejectamenta 

 of dikes, Anwick, near Sleaford, three, March 7th, 1887 ! (C. T. Musson). 



Limnaea palustris var. albida Nels. 



North Lincolnshire. — Pond by Louth Canal, with type, April 15th, 1886 I 

 (W.D.R.). 



Limnaea truncatula (Mull.). 



Occurs in several North Lincolnshire stations around Louth and 

 Alford, and in the South near Ancaster. 



North Lincolnshire. — Pond, Hall Wood, Authorpe, near Alford, numerous, 

 April 15th, 1886 (H. W. Kew). Louth Canal, one, April 15th, 1886 

 (W.D.R.). Pond, Tothby, near Alford, a few, April 14th, 1886 (W.D.R. ). 

 Coast drains, land-foot of sandhills, Huttoft, near Alford, a few, April i6th, 

 1886 (W.D.R.). The Park, Bilsby, near Alford, a few, May 5th, 1886 

 (J. E. Mason). Well foot-path, Alford, April 26th, 1886, one (J E. Mason). 

 Grimoldby, near Louth, one ! (H. W. Kew, 13, v, 87). Ditch near Hal- 

 lington Beck, four! (H. W. Kew, 13, v, 87). Louth Park, one! (H. W. 

 Kew, 7, vi, 87). 



South Lincolnshire. — Road-side stream. Ermine Street, north of Ancaster 

 Railway Station, two, April 17th, 1886 (W.D.R.). 



Limnaea glabra (Miill.). 



Has only been as yet found in a single locality — a pond near 

 Lincoln. 



South Lincolnshire. — Pool south of Lincoln, close to the railway, and not far 

 off the Main Drain, never abundant, and possibly now destroyed by railway 

 extension (Rev. W. W. Fowler, April 1886). 



Ancylus fluviatilis Miill. 



Two records only, both for the Louth district. 



North Lincolnshire. — Stream. Hubbard's Valley, Louth (H.W. Kew, April 1886). 

 Hallington Beck, near Louth ! (H. W. Kew, 13, v, 87). 



Ancylus lacustris (L.). 



Has as yet been found in but one station, Ailby, near Alford. 

 North Lincolnshire.— Pond at Ailby, near Alford, plentiful on floating logs, 



April 14th, 1886 (W.D.R.). 

 Sept. 1887. 



