246 



W. D. ROEBUCK : LINCOLNSHIRE MOLLUSCA. 



The ninth addition to the list was A?wdo?ita cygnea^ recorded for 

 Bottesford by Mr. R. Tate, in his work on British MoUusks (1866). 



In 1868, in a note in 'Science Gossip,' Mr. Thomas Ball, a well- 

 known conchologist (pity he never published a list I), recorded Physa 

 hyp?wriwi^ Flaftorbis nitidus^ and Paludina contecta^ all from Brigg. 



The thirteenth addition was that of Helix virgata in its sinistrorse 

 form, recorded by Dr. Jeffreys in his fifth volume (1869), as found 

 by Mr. Ball at New Holland. 



In the 'Field' for 1874, Mr. Hawkins recorded Helix ca?itia?ia 

 for Honington in an interesting note, afterwards reproduced by 

 Harting in his 'Rambles in Search of Shells ' (1875). 



The fifteenth (and last of the pre-1883 records) was that of 

 Helix arbustoru?n var. alpesfris, recorded for Lincoln by Mr. J. T. 

 Lightwood (in 'Nat. Hist. Notes,' 1882). 



So much for printed records : the subsequent investigations, of 

 which for the most part the results are here published for the first 

 time, will be more conveniently treated according to the various 

 districts in which they were made. 



The Louth and Alford parallelogram — the best worked area in 

 the county — naturally demands priority of attention. I had the good 

 fortune to spend the 14th, 15th, and i6th of April, 1886, with my friend 

 Mr. J. E. Mason, of Alford, in active investigation of the neighbour- 

 hood of Louth, Alford, Tothby, Rigsby, Ailby, and Well Vale, the 

 Burwell, Muckton, Maltby, and Haugham Woods, and the coast sand- 

 hills at Huttoft, Anderby, and Sutton-in-the-Marsh. During the years 

 following, Mr. Mason has collected for me at Sloothby, Chapel, Green- 

 field, Claxby, Bilsby, Farlesthorpe, Well, Rigsby, and other places near 

 Alford, with great success ; and Mr. H. W. Kew has devoted him- 

 self with great assiduity and remarkable results to the work of 

 investigation about Louth, Saltfleetby, Saltfleet, Raithby, Maltby, 

 Haugham, Burwell, Welton Vale, North Somercotes, South Elking- 

 ton, Grimoldby, Theddlethorpe, Grainthorpe, Hallington, Bracken- 

 borough, Belleau Springs, Authorpe, Acthorpe, Tathwell, Swaby 

 Vale, Fenney Wood, Hubbard's Valley, Sutton, and Mable- 

 thorpe. Outside of this area he has collected at Cleethorpes^ 

 at Benniworth Haven, and at Donington-on-Bain. No one else 

 seems to have worked this area, except that a number of drift-shells 

 have been collected at Sutton-in-the-Marsh by Mr. B. Sturges Dodd. 



The records for all other parts of the county are but scanty. 

 Mr. W. Eagle Clarke was my companion on the 14th of April, 1883,. 

 in working the marsh-drains about Wroot, at the junction of the three 

 counties of Lincoln, York, and Nottingham, when a number of fresh- 

 water forms were collected in the Gravel and Black Bank Drains. 



Naturalist^ 



