Since going to press the writer is indebted to Mrs Hughes for the following additional localities and notes on living forms from her own observations.

Neritina fluviatilis; Hauxton Mill, Ditton.

Vieipara vivipara; the record on p. 123 is based on a single specimen in Wisbech Museum, which is possibly a young V. contecta.

Limnaea truncatula; Wisbech Canal (brackish water), River Nene, Roslyn Pit at Ely.

Planorbis crista; White House Drove near Littleport, March.

Vitrea rogersi; fairly common, Cambridge, Harston, Hauxton.

V. radiatula; Hauxton Mill.

Zonitoides excavatus; Madingley, March.

Euconulus fulvus; Grantchester, Madingley, etc.

Sphyradium edentulum; Roman Road on the Gogmagog.

Hygromia granulata; Hauxton, Whittlesford, Waterbeach.

Acanthinula aculeata; found again recently in Madingley Wood by Mrs Hughes and Mr Laidlaw (see p. 121).

Vallonia pulchella; Thorney, Cherryhinton, but less common than V. costata, which is found all over the county (see p. 122).

Helicigona lapicida; alive at Fen Ditton (see p. 130); seems dying out.

Helix hortensis; not common, but occurs at Fen Ditton, Haslingfield, Fulbourn, Cherryhinton and March.

Ena obscura; fairly common in and about Cambridge.

Caecilioides acicula; in holes in gravel, Cambridge Station, the Observatory, and alive at Hauxton (see p. 121).

Jaminia cylindracea; Bracondale (Cambridge), Babraham, Hauxton, Baitsbite, Duxford.

Vertigo pygmaea; Roman Road on the Gogmagog.

Balea perversa; on willows along Bourne Brook and on elms N.W. of March.

Clausilia laminata; Madingley, Haslingfield, Cherryhinton, Fen Ditton.