14. T. haliotoidea, Drap.—T. europæa, T. scutulum.—Near London. Channel Isls., etc., Mc.
Vitrina. Shell not including the whole Slug.
15. V. pellucida, Müller, (Helix.)—H. diaphana, Helicolimax, Limacina major, etc.—Various parts of the country, under stones, etc., Mc. Eu. Very transparent.
16. V. Draparnaldi, Jeffreys.—V. oblonga, H. brevipes?—Less globular than 15, R.
Zonites. Transparent, thin-edged Snails.
17, 18. Z. cellarius, Müller, (Helix.)—H. and Z. lucida and nitens.—Brit. gen., C.
19, 20. Z. nitidus, Müller, (Helix.)—H. and Z. nitens, lucida, tennis, Succinea, etc.—Less depressed than 17, 18, with larger umbilicus.
21. Z. crystallinus, Müller, (Helix.)—H., Z., Discus, and "Polita" c., eburnea, vitrea.—In damp spots, among stones and Moss. Minute, white, transparent.
22. Z. nitidulus, Drap.—Generally distributed, Mc. Mouth oblique. Umbilicus small.
23, 24. Z. allarius, Miller, (Helix.)—H. and Z. glabra, alliacea, nitens, tenera, lurida, etc.—Distr. gen., C. Smaller and more convex than 17, 18.