H. (Hygromia) granulata is also hairy with white silky bristles. Yellowish in colour. Shell thin. Local, but abundant where found. Its umbilicus is very small. It falls from its food plants at the least shake.
H. (Hygromia) revelata.—Scantily haired. Globular thin shell. Pale green. Mainly found in Cornwall and South Devon. In cold or dry weather it buries itself rather deeply.
H. (Hygromia) fusca.—Very thin, glossy, brown shell. Local. Hardy, and even active in frost. Chiefly found on nettles, which many shells like as food, though avoiding the commonly associated horehound.
H. (Euparypha) pisana.—First noticed at Pisa. Somewhat like Helicella virgata, but larger, sub-globular, and solid shell, yellowish-white with dark lines or bands. Aperture or mouth yellowish or rosy. Most common in Portugal and Morocco, and all round the Mediterranean, dry places, especially near the sea. In England chiefly confined to Tenby and other parts of Pembrokeshire; also in the Channel Islands. Varies much in tint and markings. Swarms where found; it loves sun and heat. Seems to lend itself better to colonization than most species.
H. (Helicella) itala.—So named by Linnæus, who probably received it first from Italy. Shell almost circular, flat. Umbilicus very large and open. Common on heaths and downs, especially near the sea.
H. (Candidula) caperata.—(The specific name means wrinkled, like a goat’s horn.) Careless of heat or cold. Distinguished from the young of H. virgata by being more depressed, having a larger umbilicus, regular and strong striation, and round mouth with white internal rib. Found under stones and on grass. Common.
Helicella virgata at rest on thistle, natural size.
H. (Heliomanes) virgata (i.e. striped).—A very variable shell. See the illustration above of some at rest on thistles. Local, but very abundant where found. Whitish shell with dark bands, but a yellowish and a white variety usually is found with the type. The most beautiful variety, radiata, is chiefly found in Romney Marsh, and from Hythe to Rye.