This is the well-known dentalium pretiosum, or Tooth-shell, generally known as the Hioqua.
One of the most characteristic of them lives in dentalium, the tooth-shell.
A similar modification of the velum occurs in dentalium and in Myzomenia among the Amphineura.
Upon the west coast dentalium pretiosum is very abundant north of California.
The only genus of shells described in this family is dentalium, fig. 2, to which may be added Pharetrium, Knig.
Some of the larger species of dentalium from deep-sea stations are four to five inches in length.
They were not tattooed, but ears and noses were encumbered with pendants of dentalium and a small red glass bead.
Some of the incised designs on dentalium shells are shown in Figs. 117 and 118.
dentalium shells were found in all parts of the excavation but were most numerous in the northeastern parts.
I did not succeed in determining whether, as in dentalium, this early localization in Lanice pre-exists in the unsegmented egg.