Shell oblong, depressed; vertex slightly recurved; striated concentrically; one margin rounded, and the other truncated.
2. Emarginula. The Slit Limpet. Four species.
Most of the shells of this genus are small; some are elevated, and others of a widely-depressed conical form.
Shell conical, recurved; summit entire; slit, or more or less hollowed on the anterior side; a muscular impression in form of a horseshoe, open behind and thicker at the beginning.
Emarginula Blainvillii.
E. marginata.
E. fissura.
E. rubra.
E. Blainvillii. Blainville’s Emarginula.
Shell with the notch or slit in the middle of the back, and not extending to the margin.