Shell minute, obliquely conical, thin, pellucid, variegated with spiral opaque white intercepted striae and several transverse scarlet bands formed of oblique lines; axis, imperforated, one-sixth, diameter one-eighth, of an inch. This shell is somewhat like P. pullus, Turbo pullus of Montague, but the whorls are more convex, and it is rather differently marked. 39. Scalaria australis, Lam. Hist. 6 pt. 2. 228. Icon. -- 40. Scalaria tenuis (n.s.) Testa conica umbillcata tenuis pellucida albida unifasciata, costis albis tenuibus ereberrimis parum elevatis laevibus, anfractibus contiguis. Shell conical, thin, pellucid, whitish-brown, with a narrow central spiral brown band; whorls contiguous, convex, smooth, with numerous close oblique slightly raised, thin, simple-edged cross ribs; axis umbilicated; umbilicus narrow; mouth small, ovate, orbicular; axis three-eighths, diameter one-fourth of an inch. This shell is most like Scalaria principalis, nob. Turbo principalis of Pallas, Chemn. 11 t. 195, f. 1876, 1877. The shell before me is most probably a young specimen. 41. Delphinula laciniata, Lam. Hist. 6 pt. 2. 230. Turbo Delphinus, Gmel. Syst. Nat. 1 3599. Icon. Lister. Conch. t. 608. f. 45. This shell was found at low water upon the Coral Reefs, in the entrance of Prince Regent's River, on the North-west Coast. 42. Nerita atrata, Lam. Hist. 6 pt. 2. 191. Icon. Chemn. Conch. 5 t. 190. f. 1954, 1955. 43. Nerita textilis, Gmelin. Syst. Nat. 3683. Icon. Chemn. 5 190, f. 1944, 1945. 44. Natica mamilla, Lam. Hist. 6 pt. 2. 197. Nerita mamilla, Gmel. Syst. Nat. 3672. Icon. Lister Conch. t. 571. f. 22. Enc. Meth. plate 453. f. 5. a. b. 45. Natica alba, n. Icon. Chemn. 5 t. 189. f. 1922. 1923. 46. Natica conica, Lam. Hist. 6 pt. 2. 198. Icon. Chemn. 5 t. 189. f. 1930. 1931. 47. Littorina australis (n.s.) Testa ovata, conica fulva rudis spiraliter striata sulcata, spira acuta, fauce livida. Shell ovate, conical, fulvous-brown, rough, with numerous impressed spiral lines; the spire acute, the whorls rather convex, last slightly angular, the columella lip purplish-brown; axis solid, with a lunate concavity behind the usual situation of the umbilicus. 48. Littorina unifasciata (n.s.) Testa ovato-conica imperforata purpureo-albida laevigata, anfractibus convexis ultimo subangulato, apertura purpurea unifasciata. Icon. -- Shell ovate conical, nearly smooth, with only a few concentric ridges, and distant, scarcely impressed, very narrow, grooves; white or purplish-white outside; the whorls rather convex, last one slightly angular in front; mouth ovate; throat purple or purplish-black with a distinct broad white spiral band just below the slight external keel; inner lip purple with a deep concavity behind it; spire acute half the length of the shell; axis 8/12, diameter 6/12, of an inch. This shell has somewhat the shape of Littorina zigzag, the Trochus zigzag of Montague, but is all of one colour externally and has a much shorter spire.