304 JOURXAI. OF CONCHOI.nGY, VOL. 12, NO. II, JULY, I909. 



Helix nemoralis Linne. — Well distributed throughout the dis- 

 trict, especially on the cliffs. 



var. compressa Terver. — Ganton. 



var. ponderosa Malm. — This variety occurs in a small chalk- 

 pit at Binnington. Out of seventy specimens of H. nemoralis taken 

 at random five specimens weighed "02 oz. ; thirty-three, "03 oz. ; 

 nineteen, "04 oz. ; seven, "05 oz. ; two, '06 oz. ; three, '07 oz. ; 

 two, 'oS oz. ; and one weighed "12 oz., or six times the weight of 

 the lightest. Variation in other respects in this quarry was remarkable. 



var. albolabiata von Martens. — Binnington and Flixton. 



var. rubella Moquin-Tandon. — Castle Hill, Forge \^alley. 



var. libellula Risso. — Fairly common. 



var. roseozonata Cockerell — Castle Hill. 



var. hyalozonata Taylor. — Castle Hill. 



var. citrinozonata Cockerell — Castle Hill. 



var. undulata Gentil. — Castle Hill. 

 Helix hortensis Miiller. — Commoner than H. 7iemoralis, except 

 on the cliffs, and well distributed. 



var. roseolabiata Taylor.— Stepney Hill, Scalby Road, Scalby 

 Beckside. 



var. fuscolabiata von Martens. — Stepney Hill, Scalby Road. 



var. albina Moquin-Tandon. — Castle Hill, rare. 



var. lutea Moquin-Tandon. — Very common. 



var. olivacea Taylor.— Scalby Road, about ten per cent, of the 

 specimens on Stepney Hill, Stainton Dale, Throxenby. 



var. arenicola Macgill. — Ruston, Cay ton Bay, Castle Hill, 

 Gristhorpe, Scalby Road. 



Ena obscura (Miiller). — Generally distributed in woods and 

 hedgerows. 



Cochlicopa lubrica (Miiller). — Very generally distributed. 



var. lubricoides Ferussac — Fairly common. 



var. morseana Doherty. — Hackness, rare. 

 Azeca tridens (Pulteney). — Very local. Forge Valley only. 



Caecilioides acicula (Miiller). — Small quarry on Irton Road. 

 Dead shells abundant on Castle Hill ; Cay ton Bay, Folkton. 



Jaminia anglica (Ferussac). — At intervals in suitable places on 

 the cliffs from Speeton to Hayburn Wyke. Its usual habitat is moss 

 with water slowly trickling through it. Forge Valley, Bedale, Intake 

 Wood, Scalby. 



var. pallida Jeffreys. — Cliffs in South Bay, Forge Valley, rare. 



