6 GENUS PYRAMIDELLA. 
undulated. 'The lowest whirl is almost as large as all the 
others together: all are ornamented with numerous projecting 
longitudinal folds or ridges, extremely regular, often terminated 
at their summit by a small tubercle; between the spaces of 
the ridges are observed fine transverse strie. The coloring of 
this shell is whitish, it is ornamented with reddish spots ar- 
ranged in transverse series, almost always united, and forming 
three bands upon the upper whirls, and five upon the lower ; 
upon this is often seen also, a large brown and irregular blotch. 
Aperture ovate, elongated, narrow, and slightly oblique. Right 
lip thick, white, forming a little gutter at the base ; columella 
imperforate at its lower extremity, oblique, bearing three une- 
qual folds: the first more prominent, is horizontal, thin, and 
sharp; the two others are oblique and smaller. 
Length 11 lines. Width 4 lines. 
Inhabits the seas of the Isle of France, and the Isle of 
Vanikoro. 
This very beautiful little PyrammpELua, is remarkable for its 
longitudinal ribs. 
4. PYRAMIDELLA CORRUGATA, Lam. The Wrinkled Py- 
ranudella. 
(Collect. Mass. Lam.) 
Pl. Il, fig. 6. 
P. testA elongato-turrita, gracili, longitudinaliter plicata, alba, prope 
suturas punctis luteis raris picta ; ultimo anfractu spira multo breviore. 
Shell elongated, turreted, slender, white, with some scattered 
yellowish spots ; spire pointed, formed of nine or ten slightly 
convex whirls, the surface of which is covered with longitudinal 
folds, also convex, very distinct, smooth, numerous, regular, 
prolonged even to the summit of the whirls, and accompanied 
with some small, scattered, yellowish spots ; numerous com- 
pressed tranverse striz are found between the folds. ‘The 
suture is linear. Aperture narrow, ovate, elongated, slightly 
narrowed at its extremities ; it forms at its base a little depres- 
