ROEBUCK : UPPER SWALEDALE CONCHOLOGICAL NOTES. 233 



Limnaea truncatula. Plentiful on steep wet banks near Ivelet 

 Bridge, not uncommon in wet places by the roadsides near 

 Satron, the Strands, etc., and very numerous in a horse-trough at 

 Gunnerside. 



Ancylus fluviatilis. Plentiful in small rills in Gunnerside village, 

 where it has also been previously found by Mr. Henry Crowther, 

 numerous in streamlets near the Strands, and has also been 

 found in the Arkle Beck at Langthwaite. 



The var. gibbosa Bgt. has been found at Gunnerside by 

 Mr. Henry Crowther. 



Such is my list for the upper part of the Swale valley, which 

 alone I have had the opportunity of searching for more than an hour 

 or so. Further down the dale other observations have been made 

 by myself and friends at odd times, and these it will not be without 

 interest to recapitulate. 



For that portion of Swaledale which extends from Reeth down 

 to Richmond I am not aware of any records whatever. 



At Richmond Mr. Henry Crowther collected some dozen years 

 ago the following : — 



Helix rufescens. Pupa umbilicata. 



Helix hispida. Clausilia rugosa. 



Helix rotundata. *Limiiffia peregra and *var. ovata. 



*PIelix lapicida. Limnoea truncatula. 



Those marked with the asterisk are forms additional to my list, and 

 increase its numerical total to 37. At Richmond also Mr. Baker 

 Hudson found Clmisilia rugosa var. dubia and Helix rufescens with 

 var. r7(bens, all very abundant on walls and among nettles and stones. 

 At Easby Abbey, on the ist of August 1881, I found 



Helix hispida. * Helix pygmcea. 



Helix rotundata. Pupa umbilicata. 



The one starred brings up the Swaledale list to 38. 



The following have been found at Snape by Mr. H. Crowther ; 



Helix pulchella. *Limn3ea stagnalis. 



Clausilia rugosa var. dubia. L. truncatula. 



*Bythinia tentaculata. Ancylus fluviatilis. 



*Valvata piscinalis. *Sph3erium corneum. 



Limnaa peregra. *Pisidium fontinale. 



And at Leeming Lane near Bedale, Mr. Crowther has found 

 '^Neritina fluviatilis and Sphcerium corneum. 



These two localities, which bring in six additional species, are, 

 however, low-lying ones belonging to the central plain of Yorkshire, 

 and although undoubtedly within the Swale drainage-area, are not in 

 what may be properly called Swaledale. 



August 1890. 



