(5 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 striae. 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 PYRAMIDELLA, is remarkable for its 

 longitudinal ribs. 



4. PYRAMIDELLA CORRUGATA, LAM. The Wrinkled Py- 



ramidella. /; ^^ ^ , 



(Collect. MASS. LAM.) 

 Pi. II, fig. 6. 



P. testa elongato-turrita, gracili, longitudinaliter plicata, alba, prope 

 suturas punctis luteis raris picta ; ultimo anfractu spira multo breviore. 



Shell elongated, tutfeted, 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 striae 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- 



