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.

49. Cerithium palustre, Brug. Dict. n. 19. Lam. Hist. 7 66.
Strombus palustris, Gmel. Syst. Nat. 3521. Number 38.
Icon. Lister. Conch. t. 836. f. 62. t. 837. f. 63. Seba, 3 t. 50. f. 13.
14. 17-19. Martini Conch. 4 t. 156. f. 1472.

50. Cerithium ebeninum, Brug. Dict. n. 26. Lam. Hist. 7 67.
Icon. Chem. Conch. 10 t. 162. f. 1548, 1549. Ency. Meth. t. 442. f. 1. a,
b.

51. Cerithium morus, Lam. Hist. 7 75. not Brug.
Icon. Lister. t. 1024. f. 90 ?

52. Cerithium lima ? Lam. Hist. 7 77. Brug. Number 33.

A broken shell apparently of this species was brought home, but when a
more perfect specimen is round, it may prove to be distinct from it.

53. Cerithium perversum ? Lam.