The Conchologist's First Book / A System of Testaceous Malacology, Arranged Expressly for the Use of Schools, in Which the Animals, According to Cuvier, Are Given With the Shells, a Great Number of New Species Added, and the Whole Brought Up, as Accurately as Possible, to the Present Condition of the Science.

by Edgar Allan Poe; Thomas Brown

Semi-lunar, shape of a half moon.

Septiform, shape of a partition.

Serrated, like the teeth of a saw.

Sessile, sitting or seated.

Seta, a bristle.

Setaceous, covered with bristles.

Setiferous, bearing bristles.

Sinister valve, is the left valve.

Sinus, a groove or cavity.

Siphunculus, a cylindrical perforation as in the Nautilus, Spirula, &c.