W. D. roebuck: LINCOLNSHIRE MOLLUSCA. 27 T 



Pond near Maltby Wood, Louth, one ! (Id.). Pond in post-glacial valley 

 by Haugham Wood, a few ! (Id.). Pond in Grisel Bottom, Burwell Wood, 

 Louth : (Id.). 



South Lincolnshire. — Rejectamenta from between Bracebridge and Lincoln, 

 December 1884! (C. T. Musson). 



Pisidium nitidum Jen. 



We have several records for the Northern division, none at all 

 for the Southern. 



Iforth Lincolnshire. — Pond, Ailby, near Alford, one, April 14th, 1886! 

 (W.D.R.). Pond at Raithby^ near Louth ! (H. W. Kew, 7, vi, 87). Pond 

 in post-glacial valley by Haugham Wood, Louth, a few ! (Id.). Large 

 pond in post-glacial ravine, Haugham Pasture, two! (Id.). 



TJnio tnmidus Phil. 



Of this species and its varieties we have records for one Southern 

 and two Northern stations. 



South Lincolnshire.— Rejectamenta from between Bracebridge and Lincoln, 

 December 1884! (C. T. Musson). 



TJnio tumidus var. radiata Colb. 



Iforth Lincolnshire. — Witham drainage, Lincoln, April 1840! (J. Hardy, sen.). 



TJnio tumidus var. ovalis (Mont.). 



North Lincolnshire. — In mud of wall of antique Roman structure at Lincoln ! 

 (J. Hardy, sen.). 



TJnio pictorum (L.). 



On record for single instances in both divisions of the county. 

 INorth Lincolnshire. — Canal near Louth, a dead valve in the rubbish-heaps, 



April 15th, 1886 ! (W.D.R.). 

 South Lincolnshire. — Rejectamenta from between Bracebridge and Lincoln, 



young valves, December 1884 ! (C. T. Musson). 



Anodonta cygnea (L.). 



The premier record in date is that for Bottesford (Tate's Brit. 

 Moll., 1886), since which it has been noted for Burwell, Louth, and 

 Well in the North, and for Lincoln in the South. 



IJorth Lincolnshire. — Very abundant at Bottesford-on-the-Trent, where the water 

 is salt at high -tides (R. Tate, 1866, p. 31). Burwell Fish-pond, dead valves, 

 April 15th, 1886 ! (W.D. R.). Louth Canal, abundant in the out-cast debris, 

 April 15th, 1886! (W.D.R.). Benniworth Haven, near Louth, one! (H. 

 W. Kew, 7, vi, 87). 



South Lincolnshire. — Rejectamenta from between Bracebridge and Lincoln, 

 December 1884 ! (C. T. Musson). 



Anodonta cygnea var. zellensis (Gmel). 



ITorth Lincolnshire.— Well Fish-pond, near Alford, dead valves, April 14th, 18S6 ! 

 (W.D.R.). 



Anodonta anatina (L.). 



One record only attests the existence of this species in the county. 



'North Lincolnshire.— Greenfield Wood, Ailby parish, a broken shell, June 8th, 

 1887 ! (J. E. Masonj. 



Sept. 1887. 



