Animal. See Arenicola.
Shell very thin, conical, tubular, involuted in a spiral manner, loosely and irregularly; aperture circular, sharp edges, interrupted in the middle by a notch, extending like a slit through the greater portion of its length, and stopping abruptly at some distance from the summit. Inhabits the Indian seas. Eight species.
- Siliquaria anguina.
- S. muricata.
- S. lævigata.
- S. lactæa.
- S. rugosa.
- S. terebella.
- S. lima.
- S. spinosa.
FAMILY II.
Maldania. Two Genera.
1. Genus Clymene.
Animal. Respiratory organs not determined, supposed to be at the posterior part of the body.
Shell. Tube thin and slender, open at both ends, encrusted externally with sand and fragments of shells. One species.
Clymene amphistoma.
2. Genus Dentalium. Pl. [V].
Animal. Body elongated, conical, sub-vermiform, enveloped in a fistula mantle as far as the anterior third, and ending in a bourrelet pierced in its middle by an orifice with fringed edges; foot altogether anterior, proboscidiform, terminated by a conical appendage, contained in a kind of cup with festooned edges; head distinct, oval, with a terminal mouth in the middle of a digitated lip; a pair of lateral jaws, formed each of two little oval shells garnished with points.