Holocene Shells at Ruckland, near Louth, Lines. 121 



Limax maximiis, one example. Vallonia pulchella, common. 

 Limax arborum, rather rare. Vallonia costata, rather rare. 



Agriolimax agrestis, fairly common. Vallonia e.ycentrica, fairly common. 



Vitrina pellucida, one example. Hehcigoiia lapicida, five or six 



Vitrea crystallina, fairly common. examples. 



Polita cellaria, fairly common. Helicigona arbtistorum, one exa,mple 



Polita nitidula, fairly common. Helix nemoralis, rare. 



Polita pura, fairly common. Ena obscura, rare. 



Polita rogersi, one example. Cochlicopa liibrica, fairly common. 

 Polita radiatula, five or six ex- var. e \igua, rare. 



amples. var. lubricoides, rare. 



Euconulns fiilvus, one example. CtBcilioides acicula, abundant. 



Arion sp., abundant. Papilla miisconini, fairly common. 

 Punctiim pygmcBuni, fairly common. Vertigo pygmaa, fairly common. 



Pyramidula rotiindata, very Clausilia lamivata, common. 



common. Clausilia bidentata, fairly common. 



Helicella itala, fairly common. Clatisilia rolphii rare. 



Hygrominliheyta, iahly common. Carychiitm minimum common. 



Hygromia hispida, rather rare. Pomatias elegans, common. 



Acanthinula aculeata, fairly Acicula lineata, two examples, 

 common. 



Notes on some of the foregoing Species. — Euconulus 

 Julvus is of particular local historic interest. It was first 

 recorded by Dr. Martin Lister in 1678 for Lincolnshire : — ■ 



Titulus IX. Buccintim parvum sive Trochilus sylvalicus 

 agri Lincolniensis. Vix piperis grant dimidiitm iniplet. Ei 

 color suhflaviis, pellucidus. Ejus basis planior, senis aut 

 septem orbibus in modum Trochili finituv. In musco ad 

 grandium arborum radiees in sylvis Bunvellensibus agri 

 Lincolniensis nan semel earn inveni : est tamen ad modum 

 vara bestiola. 



De Cochleis Terrestribus, p. 123, 1678, note to figure 

 10 on plate 2 is so ; probably the engraver was unable to 

 render it justice. 



Lis+er's locality, Burwell Wood, is within three miles of 

 Ruckland Rectory. This species is now fairly common in 

 Burwell Wood. 



_ Arion sp. — Regarding the calcareous granules referable to 

 this genus, Messrs. Hinton and Kennard, in a paper on the 

 Molluscan remains from Cleeve Hill (Cotteswold), 1904, re- 

 marked ' It is notoriously difficult to determine the species 

 of this genus from these scanty remains,' and yet, in all proba- 

 bility, at least two forms are present— /I. ater and A. hortensis. 

 Of the examples found in this deposit, and submitted, Mr. 

 Kennard writes : — ' After careful consideration, I think it 

 better to call them all Arion sp. The granules you call hor- 

 tensis may be that species, for that form of granule is common 

 in hortensis but it also occurs in ater.' 



Helicigona lapicida is a rare species in North Lines., especi- 

 ally hving. Burwell Wood and South Thoresby are the only- 

 localities, as far as I know, for which it has been recorded living. 



1918 April 1. 



