01, 2. L. pereger, Müller (Buccinum.)—Helix, Turbo, Bulimus, and L. putris, inflata, teres, lutea, limosa, ovata, vulgaris, marginata, intermedia, lacustris, etc.—Springs and ponds, Cc.
03. L. stagnalis, Linn. (Helix.)—Buccinum, Turbo, etc., stagnalis, fragilis, and major, etc.—Ponds, etc., not so generally as No. 1, 2, C.
04. L. palustris, Müller, (Bucc.)—Helix and L. fragilis, fontinalis, stagnalis, etc.—Ditches, ponds, etc., C. Whorls more numerous and less rapidly enlarged than No. 3.
05. L. auricularius, Linn. (Helix.)—L., Helix, Bucc., Turbo, Bulimus a., patulus, etc.—Near London, Swansea, etc., Mc. Aperture very wide, and outer lip partially reflected.
06. L. acutus, Jeffreys.—L. auricularius, var. B. M.—Oban, Clumber Lake, Bloomfield, Kent, R. Apex sharp and tapering; aperture smaller than No. 5.
07. L. truncatulus, Müller, (Bucc.)—H., B., and L. truncatus, fossarius, minutus, limosus, etc.—Partly amphibious, generally diffused, C. Small, spire equal to body.
08. L. glaber, Müller, (Buccinum.)—H., B., and L. octanfracta, peregrina, elongata, octona, leucostoma, etc.—Fresh and brackish marshes, Stafford, Somerset, York, etc., R. Spire longer than aperture.
09. L. involutus, Harvey.—Amphipeplea i.—Lake near Killarney, Belfast, Rr. Spire almost covered.
10. L. glutinosus, Müller, (Buccinum.)—Helix, Amphipeplea, and L.—Windermere, etc., Mr. Oval.
11. L. Burnetti, Alder.—Lakes in Dumfries and Breconshire. Inflated; spire flat; colour opaque-amber.