
30. Cerithiopsis crenistria, n. sp. Plate IX, fig. 4.
Shell small, turriculate, imperforate, thin and semitrans-parent, ornamented with numerous nodules, aperture small, terminating in a short and widely open canal. Sculpture formed by 2 low spiral ribs, which are crossed by equidistant radiate costiæe, 12 on the last whorl, not reaching to the suture; the crossing-points of the two kinds of ribs are raised to very distinct nodules, first round, oval on the later whorls. Colour very

light-brown, shining. Spire high, turriculate. Protoconch of a lighter colour, 1 ½ whorls, top flattened, radially striate and on the periphery with a row of elongated small nodules. Whorls 9, the second has a slightly greater diameter than the third; sides biangulate, nearly straight; base flat, depressed round the canal. Suture very distinctly impressed, margined below by a small thread. Aperture subquadrate, produced into an open and short canal, which is a little turned to the left and backward. Outer lip sharp, but little convex, basal lip concave. Columella slightly concave, the inner lip spreading as a very thin, narrow, and whitish glaze over it.
Altitude, 8 mm.; diameter, 3 mm.
Type to be presented to the Colonial Museum.
One specimen was found, and I do not think it is adult. Our other species, C. sarissa, Murd., is smaller and more subulate, it has three spiral threads, and the nodules are less prominent.
