HARC REAVES : MOLLUSCA IN THE SCARUOROUGH DISTRICT. 303 



Hygromia hispida (Linnd). — Common in most localities. 



var. hispidosa Mousson. — Less common than the type, but 

 generally distributed. 



var. depilata Alder. — Yedmandale, Red Cliffe, Castle Hill, 

 Forge Valley. 



var. subrufa Moquin-Tandon. — Almost as common as type. 



var. albida Jeffreys. — Castle Hill, rare. Burniston, common. 

 Forge Valley, rare. 



Hygromia rufescens (Pennant). — Very local, but abundant 

 where it occurs. Scarborough, Scalby, Sufifield, Hackness, Hun- 

 manby, West Ayton in a garden. 



var. rubens Moquin-Tandon. — Scalby. 



var. alba Moquin-Tandon. — Sufifield. 



Acanthinula aculeata (Miiller). — Widely but sparingly distri- 

 buted. Hackness, Cloughton, Raincliffe, Forge Valley, Yedmandale, 

 White Nab, Hayburn Wyke. 



Acanthinula lamellata (Jeffreys). — Sparingly distributed. Hack- 

 ness, Suffield, Raincliffe, Forge Valley, Hayburn Wyke, common in 

 Yedmandale. Affects dead holly and beech leaves. 



Vallonia pulchella (Miiller). — Brompton, near Ayton, Yed- 

 mandale. 



Vallonia COStata (Miiller). — Ruston, Ayton Road, Castle Hill, 

 Seamer Moor, Sufifield, Hackness. 



Vallonia excentrica Sterki. — Ayton Road, rare. 



Helicigona arbustorum (Linne). — Generally distributed and 

 common. Cliffs north and south of Scarborough, Forge Valley, 

 Yedmandale, Raincliffe, Ganton, Hayburn Wyke. 



var. alpestris Ziegler. — Castle Hill. 



var. fiiscescens Duch. — Not uncommon on Castle Hill. 



var. cincta Taylor. — Cliffs north and south of Scarborough. 



var. flavescens Moquin-Tandon. — Castle Hill. Scalby Road, 

 Spa Grounds. 



Helix aspersa Miiller. — Generally distributed and common in 

 suitable localities. Occasionally gathered by fishermen for bait, 

 var. conoidea Pascal. — Castle Hill, 

 var. undulata Moquin-Tandon. — Castle Hill. 

 var. zonata Moquin-Tandon. — Castle Hill. 

 Helix pomatia Linne. — An attempt was made in 1868 to intro- 

 duce this species in Forge Valley. No living specimens have been 

 obtained for many years, but a dead shell was found in 1907. 



