Seila dissimilis: Diameter, 0.8 mm. ; height, 2.5 mm.

Seila dissimilis: New Zealand: Snares, in 50 fathoms.

Shell small, acicular, almost cylindrical, rather thin. Sculpture consisting of 3 cinguli, the uppermost close to the suture and less elevated ; a fourth smooth kee: on the last whorl, continued from the suture ; crossed by straight axial riblets, about 15 on the last whorl; the points of intersection raised to conspicuous rounded gemmules on the second and third keel, the first, however, remaining nearly smooth. Colour yellowish-brown, the first 3 whorls slightly darker. Spire high, subcylindrical, but tapering toward the apex, very much higher than the aperture; outlines straight. Protoconch papillate, of smooth, convex, and shining whorls. Whorls 8 to 9, regularly increasing, convex ; base slightly concave and smooth. Suture impressed. Aperture vertical, subquadrangular, produced below into a very short, open, and emarginate canal. Outer lip sharp, sinuated on the outside by the spiral keels. Columella vertical, straight above, bending over in a curve to the canal below. Operculum unknown.
Diameter, 1,1 mm. ; height, 3,7 mm.
Animal unknown.
Type in my collection.
Hah.—Snares, in 50 fathoms (Captain Bollons),

Seila dissimilis: Shell minute, subcylindrical, rather thin. Sculpture : The first 2 whorls are smooth, the succeeding ones have 3 prominent, unequal, equidistant, and flat cinguli, the oppermost narrower, lower, and close to the suture ; the last whorl has a fourth cingulum toward the base, but quite close to the upper one ; indistinct axial riblets and fine growth-striae are visible in the interstices ; the cinguli on the third to fifth whorl are faintly nodulous, but those on the later whorls remain smooth. Colour light yellowish-white. Spire high, subcylindrical, much higher than the aperture ; outlines straight. Protoconch paucispiral, globose, of 2 smooth and convex whorls. Whorls about 6, regularly increasing, very little convex ; base smooth, slightly concave. Suture not deep. Aperture, subquadrangular, with a short and open canal below. Outer lip sinuated by the spiral sculpture. Basal lip almost straight. Columella subvertical, nearly straight, narrowing to a point below. Operculum unknown.
[Suter, 1913]