it has a delicate horn color, of few abruptly enlarging whorls indistinctly defined by a spiral thread and showing sinuous transverse lines of growth.

The jaw plates are thin, delicate horn-color with a broad band of very dark brown along the strongly serrate, cutting edges.

The radula consists of numerous rows of delicate colored, rather stout, non-serrate teeth, each row having a series of thirteen: —a very small central or median tooth with rather long, strongly curved tip, placed a little above and alternating somewhat with the rest of the series.

Beyond, three, about equal, much narrower, somewhat sickle-shaped, marginal ones with a small triangular, scarcely perceptible, platelike one on the outer edge.

In that species, or rather variety, there are but eleven teeth in each series, the second or outer lateral tooth having a double or bilobed tip (these.