266 



W. D. ROEBUCK : LINCOLNSHIRE MOLLUSCA. 



Planorbis vortex (L.). 



More plentifully and widely distributed than the last. Recorded 

 from numerous localities about Wroot, Louth, Alford, Sutton, and 

 Chapel, also for Lincoln. Anv.'ick, and Crowland in South Lincoln- 

 shire. 



Ncrth Lincolnshire. — Plentiful in the Louth Canal near Louth, April 15th, i8S6r 

 (W.D.R. ). Coast drains at land-foot of sandhills, Sutton-in-the-Marsh, 

 plentiful, April i6th, 1886 1 (W.D.R.). Sloothby, near Alford, several, 

 mostly juv., August 4th, 1886! (J. E. Mason). Bradley's Paddock, 

 Chapel, August i6th, 1886 1 (J. E. Mason). Rejectamenta of Main Drain, 

 Chapel, numerous, August 20th, 1886 ! (J. E. Mason). Ditches, Sampson's 

 Lane, common, April 14th, 1883! (W.D.R.). Gravel Drain near Wroot, 

 one, April 14th, 1883! (Id.). Black Bank Drain at Candy Hall Bridge, 

 April 14th, 1883 : (W.D.R.). Theddlethorpe, a few! (H. W. Kew, April 

 1887). Sutton-on-Sea, numerous in drift at high-water mark ! (B. S. Dodd, 

 4, xii, 86). Sutton, two ! (H. W. Kew, April 1887). 



South. Lincolnshire, — Rejectamenta from between Bracebridge and Lincoln, 

 December 1884 1 (C. T. Musson). Anwick, near Sleaford, one. in rejectamenta 

 of dike, March 7th, 1887 ! (C. T. Musson). Crowland Wash, [uly 1886 I 

 (T. W. Bell). 



Planorbis carinatus Miill. 

 Plentiful in various places in the vicinities of Wroot, Louth^ 

 Alford, and Sutton. Its South Lincolnshire localities are Lincoln 

 and Anwick. 



North Lincolnshire.— In the canal near Louth, plentiful, April 15th, 1886 1 

 (W.D.R. and H. W. Kew). Ditch alongside Black Bank Drain, common, 

 April 14th, 1883: (W.D.R.). Rejectamenta of Main Drain, Chapel, 

 numerous, August 20th, 1 886 I (J. E. Mason). Ditches impregnated with 

 iron, Sampson's Lane, near Wroot, common, April 14th, 1883 1 (W.D.R. ). 

 Ditches, Sampson's Lane, near Wroot, common, April 14th, 1883! (W.D.R.). 

 Sutton-on-Sea, a few in drift at high-water mark ! (B. S. Dodd, 4, xii, 86). 



South Lincolnshire. — Rejectamenta from between Bracebridge and Lincoln, 

 December 18S4 (C. T. Musson). Rejectamenta of dike at Anwick near 

 Sleaford, two, March 7th, 1887! (C. T. Musson). 



Planorbis complanatus (L.). 



An abundant and well-distributed species about Louth, Alford, 

 and Sutton, and, in the South, about Lincoln, Boston, Anwick, and 

 Crowland. 



North Lincolnshire.— Sandhills, Huttoft, near Alford, plentiful in the drains, 

 April i6th, 1S86I (W.D.R.). Sloothby, near Alford, a few, both adult and 

 juv., August 4th, 1886 ! (W.D.R.). Sutton, two! (H. W. Kew, j^, iv, 87). 

 The Park, Bilsby, near Alford, a few, May 5th, 1886! (J. E. Mason). 

 Theddlethorpe, a few! (H. W. Kew, April 1887). Rejectamenta of Main 

 Drain at Chapel, numerous, August 20th, 1886 1 (J. E. Mason). Louth 

 Canal, a few, April 15th, 1886! (W.D.R.). Bradley's Paddock, Chapel, 

 August i6th, 1886 ! (J. E. Mason). Farlesthorpe, a few, ]May 25th, 1887 I 

 {]. E. MasonK Sutton-on-the-Sea, in drift at high-water mark, a few sent I 

 (B. S. Dodd, 4, xii, 86). 



South Lincolnshire. — Rejectamenta from between Bracebridge and Lincoln, 

 December 1884 ! (C. T. Musson). Crowland Wash, July 1886 ! (T. W. Bell). 

 Foss Dyke, collected by J. Whitwham ! (W. Nelson). Foss Dyke, Lincoln I 

 (Coll. W. Nelson). Near Boston, two, September 8th, 1884! (W.D.R). 

 Rejectamenta of dikes, Anwick near Sleaford, a few, March 7th, 1887 1 

 (C. T. Musson). 



Naturalist^ 



