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A HISTORY OF NORTHAMPTONSHIRE Helicigona lapictda (Linn.). Local. Castle Ashby ; Brackley ; Rockingham ; near Rothwell ; Weekley Hall Wood — arbustorum (Linn.) Helix aipena, Miill. — poniatia, Linn. John Morton records, in 171 2, that Lord Hatton unsuccessfully attempted to introduce this species at Kirby. About 1850 it was reported at Woodford, where it was said to have been introduced by General Arbuthnot, and it has been recently re-discovered in that locality — ntmortilis, Linn. — hortensis, Mali. BuTiminus obscun/s (Mull.) Cochlicopa lubrica (MuU.) Azeca tridem (Pult.). Two specimens at Yardley Chase Ciecilianella acicula (Mill!.). Kettering ; Middleton ; Deenethorpe ; Sibbertoft Pupa cylindracea (Da C.) — muscorum (Linn.) Sphyradium edmtulum (Drap.). Campion's Spinney, near Northampton ; Castle Ashby ; Oakley Wood ; Delapr6 Wood Vertigo pygmiea (Drap.) — pusilla, Mull. Danes Camp Bdlta perversa (Linn.) Clauiilia laminata (Mont.) — hidentata (Strom.) — rolphii^ Gray. Six specimens in Sywell Wood Succinea putris (Linn.) — e/egans, Risso b. Basommatophora Carychium minimum, MtiU. Ancylui fluviatilis, MuU. Rare. Wootton Brook ; Bnrton Brook ydletia lacustris (Linn.). Rare. River Nenc, Northampton ; Ise Brook ; some of the canals Lintnaa auricularia (Linn.) — pertger (Miill.) — palustris (Mull.) — truncatula (Mull.) — itagnalis (Linn.) riancrbii corncui (Linn.) — albm. Mall. — glaber, Jeff. — nautileui (Linn.) — carinatui, Mull. — marginalus, Drap. — vortex (Linn.) — spiror/'is, Mall. — contortui (Linn.) — fontanui (Lightf.). Pond by Naseby reser- voir ; Castle Ashby pond — Uncatm (Walker). One dead specimen in Ise Brook, near Desborough Physa fontinalis (Linn.) IL PROSOBRANCHIATA Bithynia tentaculata (Linn.) — leachii (Shepp.) Vivipara vivipara (Linn.) — contecta (Millett) Valvata piscinalis (Mull.) — cristata, Mull. Borough Fen, near Peterborough — elcgans (Miill.). Colony at Kettering ; two dead shells at Loddington, one at Brackley Neritina fiuviatilis (Linn.) B. PELECYPODA Dreissemia polymorpha (Pall.) XJnio pictorum (Linn.) — tumidus, Retz Anodonta cygKiea (Linn.) Spharium rivicola (Leach). Blisworth Canal ; River Nene, Northampton — corneum (Linn.) Spharium lacustre (Mllll.) Pisidium amnicum (Miill.) — pusil/um (Gmel.) — fontinale (Drap.) — milium (Held.). Castle Ashby ; Ise Brook ; Weekley Hall Wood 88