Genus PYRAMIDELLA, Lamarck. 
THE PYRAMIDELLA. 
Testa turrita, conico-elongata, epidermide destituta. Apertura integra, 
semi-ovalis; labro acuto. Columella basi producta, subperforata ; plicis 
tribus transversis. Operculum corneum. 
Shell turreted, conical, elongated, slightly striated, destitute 
of epidermis. Aperture entire, semi-oval, widened at its base, 
lip inferiorly sub-perforated, and with three transverse folds. 
Operculum horny, thin, ovate, elongated, elements very fine, 
and folds oblique. 
Animal having a head surmounted by broad, rather long 
tentacule, formed like a pomted horn, and open on the side. 
The mouth situated in a flattened, wide, dilated, and quite 
deeply two-lobed muzzle, separated from the foot by a groove. 
The respiratory cavity open throughout the whole length of 
the mantle, bearing on its right margin a long and narrow 
branchia. ‘The heart has a direction from right to left. The 
rectum and uterus are attached to each other along the bran- 
chie, and terminate in an ear-shaped gutter, produced by the 
margin of the mantle. ‘The mucous follicles line the upper 
wall of the cavity. The foot is round, without a marginal 
furrow, passing down before in form of an ear-shaped shield, 
and bearing posteriorly a membranous operculum, with lamine 
destitute of a spire, which possesses one or two notches to slip 
upon the folds of the columella. 
Pyramidella. A 
