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Show 1885.] FROM THE SOLOMON ISLANDS. 605 52. N E R I T I N A DUBIA, Chemnitz. Hab. From a stream, Shortland Islands. The single specimen from this locality is of a dark olive tint, marked with slender zigzag black lines very closely packed together except upon the last half of the body-whorl, which is destitute of the black lineation but is quite distinctly spirally ridged, the ridges being about as fine as in N. subsulcata. 53. NERITINA ADUMBRATA, Reeve. Hab. A stream in Choiseul Bay, and found living on the sides of a deep ravine worn by a stream iu a soft calcareous rock, Ugi Island. N. cuvieriana of Reeve (Conch. Icon. sp. 87), which may not be the form described by Recluz under that name, is certainly the same as this species. The specimen figured in the ' Conchologia Iconica' (figs. 57 a, b), is not half the size of some of the shells collected by Mr. Guppy. The figures are not good, and do not convey the shape correctly. The aperture narrows in front, and the columella is less sharply sinuated in the middle, and finely crenulated along the edge. As in some other species, the colour is rather variable, some examples appearing at a distance uniformly dark olive, but on closer inspection, especially on the upper whorls, exhibit spotted markings. Others are distinctly mottled and spotted all over, whilst others again are transversely banded. The red stain on the collumella is present in most specimens, but is only feebly indicated in some of the smallest. The operculum is white or of a flesh tint on the outer surface, and generally has a livid stain at the nucleus. It is rather smooth, exhibiting fine lines of growth and a few feeble longitudinal striae. The inner surface is of a darker flesh tint, and has a slightly elevated pale obsolete ridge curving from the nuclear end to the middle of the columellar or straight side. The outer curved margin is also a little thickened within. The erect process is rather slender. The largest specimen has an extreme length of 34 millimetres. 54. NERITINA PULLIGERA, Linne. Hab. Choiseul Bay and Ugi Island (Guppy); Guadalcanar Island (Macgillivray) ; and San Christoval (Brenchley). Of the two specimens from Ugi one is peculiar in having only a slight trace of the orange-red colour of the aperture. In addition to the localities cited by Martens in his monograph of this genus (Conch.-Cab. ed. 2, p. 51), I might mention Queensland, Australia, on the authority of Tenison-Woods, and of a specimen in the British Museum presented by Mr. Wickham. 55. NERITINA PETITI, Recluz. Hab. Treasury and Faro Islands. This species also occurs at the Fiji Islands, where it was collected bv Macgillivray. Its further distribution has been given by Martens in the Conchylien-Cabinet. His surmise that N. californica of |