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Show 1878.] FROM THE ANDAMAN ISLANDS. 815 47. MITRA (CALLITHEA) OBELISCUS, Reeve, Conch. Icon. ii. fig. 107. A small specimen, not quite adult, from the Andaman Islands, agrees with those from the Philippines in all respects, but has the second white band below the middle of the body-whorl more conspicuous than usual. 48. MITRA (COSTELLARIA) EXASPERATA, Chemnitz; Reeve, Conch. Icon. fig. 162. M. torulosa, Lamk., Kiener, Coq. Viv. pl. 25. fig. 77. Hab. Java; Philippines. 49. MITRA (COSTELLARIA) DESHAYESII, Reeve, Conch. Icon. fig. 170. Hab. New Caledonia (Mus. Cuming). Capt. Wilmer tells me that the orange-scarlet markings on this pretty species fade considerably after death. One of the specimens he collected is 25 millims. long. The mouth is purplish black within, with a single white zone; and the lip is white within at the margin. 50. RANELLA PUSILLA, Broderip, P. Z. S. 1832, p. 194; Sowerby, Conchol. Illustr. fig. 1*, fig. la, var.; Reeve, Conch. Icon. ii. figs. 44 a, b (both varieties). (Plate L. fig. 15). Triton laciniatum, Mighels, fide Pease, Amer. Journ. Conch, iv. p. 107. Var. =B. rosea, Reeve, I. c. fig. 46. Var. =Bursa concinna, Dkr. P. Z. S. 1862, p. 239. Hab. Lord Hcod's Island and Philippine Islands ; Red Sea. B. rosea, Reeve, and concinna, Dkr., which I consider varieties of this species, are distinguished from the normal form almost solely on account of a difference in colour. If this were tenable, the Andaman shell would constitute a third species ; for it certainly varies in this respect either from B. pusilla, concinna, or rosea. The principal colour is reddish brown; the lowermost series of granules on the upper whorls, the fourth and fifth series from the top of the body-whorl, and the second rib from the suture on each varix, on all the whorls, are yellow. The columella is purple, with three or four transverse whitish nodules, and within the outer lip near its edge there are about eight white bead-like granules on a dark-purple ground. The interior of the aperture is purple-brown, with the exterior yellow zone visible. The normal form of the species described by Broderip is white in every part. In the Museum series of nearly 40 specimens there are various intermediate and connecting gradations between this and the pink form (rosea) or the brown variety (concinna). In fact, the differences are so subtle, that I feel it impossible to draw a line of distinction any where between these varieties. The difference in specimens apparently adult is very striking. The largest example of |