Art. XXXVII.—Additions to the List of New Zealand Shells.
[Read before the Wellington Philosophical Society, 20th August, 1881.]
Buccinulus gracilis, sp. nov.
Whorls 8, finely and closely spirally grooved. Body whorl rather constrieted in the middle; the spiral grooves are much finer at the anterior end of this whorl, and as they approach the lip, which is very thin and sharp. White.
Length .85 inch. Breadth 37 inch.
Wellington: collected by Mr. C. Holdsworth.
This shell is easily distinguished from Buccinulus kirki, Hutton, (the type of which is in the Colonial Museum), by the greater number of whorls, its more elongate and less robust appearance, and by the greater number and closer proximity of the spiral grooves.
Buccinulus huttoni, sp. nov.
Whorls six, with numerous fine spiral grooves. Columella with double fold, but more prominent than in the preceding species. Spire very short, giving a decidedly robust appearance to the shell. Ground colour, white with longitudinal brown wavy lines.
Neritina fluviatilis, Linn.
Neritina fluviatilis, Jeffreys, Brit. Conch., i. p. 53.
Shell convex above, slightly compressed towards the spire, and almost concave below, solid, moderately glossy, yellowish or brown, with often brown or white zigzag streaks, spots, or bands, which run lengthwise or in a spiral direction, and marked with fine but distinct transverse striæ or plaits, which are more conspicuous towards the suture; epidermis thin: whorls three, rather convex, the last or lowermost exceeding two-thirds of the whole shell, increasing very rapidly and disproportionately in size; spire very short and oblique; suture rather deep; mouth of aperture semilunar; outer lip sharp; pillar-lip exceedingly broad, polished and flat, with a sharp and plain edge.
The only other species of Neritina recorded from New Zealand is N.zealandica, Reclwz., P.Z.S., 1845, p. 120; but it appears doubtful if the specimens were actually procured in this country.
Those now under consideration were found among the debris brought down by the Waikanae River; probably if the stream were carefully examined further up living examples might be procured, and it is important that this should be done, in order that the animal may be described as well as the shell. A considerable number of specimens were obtained, and submitted to careful examination, yet although there are minor points of difference, the general characters agree so well with the description of N. fluviatilis that I am obliged to refer it to that species. Probably, however, the animal when discovered will exhibit sufficient distinctive characteristics to warrant the foundation of a new species.