SOPPITT AND CARTER : UPPER AIREDALE MOLLUSCA. 



Helix aculeata Miill. Very local. Harden near Bingley, 1875 

 (W. Nelson) ; Shipley Glen, three examples, 1887 ; Seven 

 Arches near Bingley, common, 1887. 



Helix aspersa Miill. Very rare off limestone. Beckfoot I.ane, 

 Bingley, one, dead, 1881 ; Steeton, several (J. Ellison); not un- 

 common in gardens at Airton, near Malham, 1887. 



Helix nemoralis L. Generally distributed, but most abundant 

 on limestone. 



Var. roseolabiata Tayl. Several specimens near Calverley, 



agreeing in colour with var. petiveria Moq., with the five bands 



of the type present. 

 Var. albolabiata Von Mart. Railway embankment near Idle, 



with the colour of var. libelliila Risso, and the band-formula 



00100. 



Var. libellula Risso. Frequent, and variously banded. Apperley, 



Bingley, Malham, Calverley, Havvksworth. 

 Var. rubella Moq. Malham, Apperley, Nab Wood, Saltaire, 



Calverley, etc. — with and without bands. 

 Var. petiveria Moq. Frequent, the banded form most common. 



Gilstead, Apperley, Calverley ; canal-bank. Idle ; etc. 

 Var. castanea Moq. Rare. Several examples near Apperley. 

 Helix hortensis Miill. Like the last, this species is most 



abundant on a limestone soil. Its occurrence off limestone in 



numbers and variety is chiefly on railway embankments. Several 



named varieties occur with the type. 

 Var. minor Moq. Near Apperley. 



Var. lutea Moq. A common form. Bingley, Apperley, Malham. 



Var. olivacea Tayl. Confined to the railway embankment near 

 Apperley, where it was first found by Mr. A. Hartley, to whom 

 we are indebted for a fine series of specimens. 

 Helix arbustorum L. Most abundant on limestone, and 

 doubtfully indigenous on the millstone grit, its occurrence in 

 numbers being in the vicinity of lime-kilns. Gordale Scar, 1877 

 (W. Nelson) ; Malham, 1882 ; Airton; Gargrave (J. Whitwam); 

 Bell Busk (W. Nelson); Rilstone, 1887; one dead specimen 

 amongst rejectamenta of river Aire at Cottingley ; one, Seven 

 Arches, near Bingley ; common and increasing in numbers at 

 Apperley, in proximity to a lime-kiln. 



Var. alpestris Ziegl. Airton near Malham, 1883. 



Var. marmorata Tayl. Airton, common, 1882; Rilstone; 

 Ap perley, frequent, 1887. 



April 1888. 



