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Show 1SS5.] FROM THE SOLOMON ISLANDS. 955 millim., and is 35 wide, the aperture being 60 in length. As an instance of extreme variation, I give the dimensions of one of the specimens collected by Mr. Guppy: length 104, breadth 29 1; aperture only 50 long. The sculpture of this species does not appear to have been hitherto properly described. In well-preserved specimens the first four whorls are sculptured very much like a fine thimble. A cessation in growth or some important change then takes place, which is marked on the shell by an oblique indentation, from which point the sculpture alters, consisting of coarsish lines of growth and irregular spiral striae. The peristome varies in colour, being either white or almost golden, but generally of a reddish-flesh tint. The columella-twist is also variable, in some specimens being much thicker and more contorted than in others. 21. BULIMUS (PLACOSTYLUS) FOUNAKI, Hombron and Jac-quinot. Hab. Faro Island, Bougainville Straits. This species has not been recorded from so northern a locality, and in fact has only been previously obtained at Ysabel Island. The name of this species has (perhaps rightly) been changed by Mi Crosse to B. hombroni. 22. BULIMUS (PLACOSTYLUS) MILTOCHEILUS, Reeve. Hab. Ugi or Gulf Island, the south-east part of San Christoval and Santa Anna. The last island is a new locality for this species, the distribution of which has been given by Brazier in the ' Proceedings of the Zoological Society,' 1869, p. 162. He says that it varies much in size and colour. An interesting variety with a white lip was obtained by Mr. Guppy both at San Christoval and Santa Anna. Like B. cleryi this species has the upper whorls finely punctate, and suddenly alters the character of the sculpture after two and a half volutions have been formed. In adult shells this peculiar pitting on the apical whorls is generally more or less obliterated. 23. PARTULA, sp. A small species of this genus was collected by Mr. Guppy in Treasury Island and at Choiseul Bay, which appears to be very like P. cinerea, Albers. The same species was also obtained at Gulf Island by'Mr. Brenchley, and at Guadalcanar by J. Macgillivray, both of whom presented specimens to the British Museum. Albers describes the whorls of his species as " planiuscuh," whereas in all the examples under examination they are rather convex, but with this slight exception they correspond very closely with his diagnosis. 24. SUCCINEA SIMPLEX, Pfeiffer, var. Hab. " From marshy districts where Taro is cultivated, Treasury and Shortland Islands '"' (Guppy). _ These specimens are of a darker tint than those described by |