NASSA. 393 



the length of the body-whorl, but more frequently sur- 

 passes, than is inferior to it, in length ; it is composed 

 of seven rounded turns that are divided from each other 

 by a fine but strongly pronounced suture ; the pemdt 

 volution is more or less tumid, and of rapid longitudinal 

 increase. The body-whorl is rather broad for its length, 

 and moderately ventricose ; its basal declination is convex, 

 and not particularly sudden ; a deep and abrupt groove 

 severs it from the very short recurved whitish canal, which 

 latter is stained internally with chocolate-brown. The 

 aperture, which in mature examples is very small for the 

 size of the shell (yet the outer lip itself, for the varix rises 

 a little above the body, occupies from two-fifths to almost 

 half the entire length) is of a suborbicular or rounded oval 

 shape, is contracted, but not acutely so, above by the slight 

 projection of the base of the penult whorl into the mouth, 

 and terminates anteriorly in a short and abruptly oblique 

 narrow canal. Both lips are white or pale yellow ; the 

 enamel is not very thickly spread or widely diffused upon 

 the body ; there is a more or less distinct narrow pad on the 

 inner lip, at the upper corner of the aperture. The throat, 

 which usually participates more or less in the external 

 colouring, but is sometimes whitish, sometimes of a livid 

 purplish tint, is guarded at its entrance, on the right, by 

 about half a dozen tubercular crense. The outer lip, though 

 solid, is bevelled to a fine edge ; it is moderately prominent 

 above, well arcuated and not prickly below. More or less 

 perceptible, somewhat horizontal, raised corrugations cross 

 the pillar lip, which latter is straightish, very solid, and 

 appressly reflected. The columella is simply corded in a 

 spiral direction. Our largest example measured two-thirds 

 of an inch in length, and about half as much in breadth. 

 The animal is white, speckled with brown, and some- 



VOL. III. 3 E 



