HAROREAVES : >rOLl.USCA IN THE SCARBOROUGH niSTRICT. 3015 



Jaminia cylindracea (DaCosta). — Well distributed and occa- 

 sionally extremely abundant. 



Jaminia muscorum (Linne). — Not so common as the last 

 species. Castle Hill, Forge Valley, Low Dales near Hackness, Step- 

 ney Hill, Wolds near Sherburn, very common on wall at Brompton. 

 var. edentula Clessin. — East Ayton Quarry, rare, 

 var. brevis Baudon. — East Ayton Quarry, rare. 



Vertigo antivertigo (Draparnaud). — Very abundant on Castle 

 Hill before the bog was drained ; Throxenby Mere, Forge Valley, 

 Seamer, rare on South Cliff. 



Vertigo substriata (Jeffreys). — Boggy ground, Raincliffe, Forge 

 Valley, cliffs beyond Spa. Most easily found on leaves oi Iris. 



Vertigo pygmaea (Draparnaud). — In 1896 in great abundance 

 under stones in a ravine in Forge Valley, hundreds of specimens 

 being taken. Rare on Castle Hill, Intake Wood, near Seamer station, 

 Suffield, Seamer Moor. 



Vertigo pusilla Miiller.— Wall at West Ayton, rare. 



Balea perversa (Linne). — Abundant on wall at Suffield, Forge 

 Valley, Sawdon, also found in Raincliffe and at Hay Brow. 



Clausilia laminata (Montagu). — Fairly common in Forge 

 Valley, Yedmandale, Hackness, Low Dales, Scalby Beckside. 



Clausilia bidentata (Strom). — Generally distributed. Hackness, 

 Forge Valley, File}-, Castle Hill, Scalby, Harwood Dale, Ruston, 

 Brompton. 



Succinea putris (Linne). — Fine and deeply-coloured specimens 

 in Forge Valley ; also occurs on cliffs north and south of Scarborough, 

 the Carrs, Folkton, Flixton, Seamer, Low Dales, Stainton Dale. 



Succinea elegans Risso. — Boggy ground south of Spa, rare; 

 Forge Valley with Jaminia an^Hca, rare. 



Carychium minimum Miiller. — In suitable localities throughout 

 the district. 



Ovatella bidentata (Montagu). — Dead specimens on shore, 

 1908. Said to have lived on the piers some years ago, but cannot 

 now be found, and cannot have lived there for many years. More 

 probably drifted down the coast. 



Ancylus fluviatilis Miiller. — Peasholme Beck, Scalby Beck, 

 Burniston Beck, fine ; Harwood Dale, Low Dales, River Derwent. 



Acroloxus lacustris (Linne). — River Derwent in Forge Valley, 

 ponds in Cayton Bay, Beast Cliff, Harwood Dale, Cayton. 



Limnaea auricularia (Litme). — Hackness Lake, Scalby Cut, 

 River Derwent at Ayton. 



var. acuta Jeffreys. — Hackness Lake, River Derwent. 



