W. D. ROEBUCK : LINCOLNSHIRE MOLLUSCA. 249 



Arion ater (L.). 



Common in the neighbourhood of Louth, Alford, and Grimsby. 



Not yet on record for the Southern division of the county. 



Korth Lincolnshire.— Sloothby, one, half-grown, type, August 4th, 1S86 ! (J. E. 

 Mason). Farlesthorpe, several, not quite adult, May 25th, 1887 ! (J- E- Mason). 

 Great Cotes, October 5th, 1883 ! one brought (W. E. Clarke). 



Arion ater var. brunnea Roeb. 



A common variety, recorded for one or two locaHties near Louth. 

 Norih Lincolnshire. — Grisel Bottom, Burwell Woods, common, September 4th, 

 1886 ! (H. W. Kew). Suh-var. brunneo-pallescens (ms. var., very pale 

 brown), Louth, adult, August 31st, 1886! (H. W. Kew). 



Arion ater var. nigrescens Moq. 



A not uncommon form, though only once recorded. 



North Lincolnshire. — Louth, one, approaching albolateralis, October 5th, 1886 ! 

 (H. W. Kew). 



Arion subfuscus Fer. 

 Not by any means so frequent in its occurrence as the other 

 species of the genus. Recorded from the Louth and Alford districts 

 only. 



North Lincolnshire. — Maltby Wood, near Louth, one, April 24th, 1886! 

 (H. W. Kew). Farlesthorpe, one. May 25th, 1887 ! (J. E. Mason). 



Arion hortensis Fer. 



Abundant and widely distributed about Louth, Alford, and near 

 Ancaster. 



North Lincolnshire. — Rigsby Farm, near Alford, common, April 14th, 1886! 

 (W.D.R.). Ailby, a few, April 14th, 1886! (W.D.R.) Well Vale, near 

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

 a few, juv., April 14th, 1886! (W.D.R.). Burwell Wood, near Louth, 

 one, very juv., April 15th, 1886! (W.D.R.). Haugham Wood, near 

 Louth, one, adult, April 15th, 1886 ! (W.D.R.), Sloothby, several, imma- 

 ture, August 4th, 1886 ! (J. E. Mason). The Park, Bilsby, near Alford, two 

 juv., May 5, 1886 I (J. E. Mason). Greenfield Wood, Aby parish, 

 several juv., June 8, 1887! (J. E. Mason). 



South Lincolnshire. — Ermine Street, north of Ancaster Railway Station, a few, 

 April 17th, 1886! (W.D.R.). 



Alion hortensis var. subfusca C. Pfr. 



North Lincolnshire. — Sloothby, one, adult, foot deep-orange, August 4th, 1886 ! 

 (J. E. Mason). 



Arion hortensis var. pallida. 



North Lincolnshire.^ — Farlesthorpe, several, juv., May 25th, 1887 ! (J. E. 

 Mason). 



Arion bourguignati Mab. 

 This is abundant and well-distributed in the neighbourhood of 

 Louth, Alford, and Boston. In South Lincolnshire it has been 

 noted near Boston and Ancaster. Frequents open country more 

 than A. hortensis, which is partial to cultivated and rich land. 



Aug. 1887. 



