ODOSTOMIA. 157 



coloured stripe of unequal breadth, which is composed of very 

 minute points so as to give the stripes a mottled look ; a tinge 

 of the same colour pervades the basal portion of the tentacles 

 and upper surface of the foot : mantle having a small offset at 

 the upper angle : snout long and slender, greatly thickened at 

 its base, and much compressed towards the other extremity, 

 which is slightly funnel-shaped : tentacles comparatively long 

 and slender, united at the bases, and having very distinct white 

 inflated tips : eyes conspicuous, close together, and imbedded 

 at the inner angles of the tentacles : foot in slow march short, 

 broad and obtuse ; but when the pace is accelerated it becomes 

 attenuated and extends to the bottom of the penultimate whorl ; 

 it makes in front a concave sweep, ending on the right and left 

 in very slight ear-shaped points ; it has a somewhat lanceolate 

 shape behind. (Clark.) 



SHELL forming an elongated pyramid, rather solid, almost 

 opaque, glossy : sculpture, numerous fine and oblique or 

 sometimes tiexuous longitudinal ribs which do not reach to the 

 base ; the last whorl has about 20 of these ribs ; they are in- 

 terrupted at the periphery and crossed by 3 prominent spiral 

 ridges placed near together, which occupy the middle of the 

 body-whorl, and there is also another but slighter spiral ridge 

 (and occasionally a 5th, rudimentary one) below the periphery; 

 the lower part of each of the upper whorls has 2 ridges ; the 

 points where the ridges cross the ribs are nodulous or tuber- 

 cular ; the top whorl is smooth : colour whitish : spire remark- 

 ably turreted, in consequence of each whorl being broader at 

 the base than the upper part of the succeeding whorl, and ap- 

 pearing to overlap the suture in an imbricated manner ; nucleus 

 somewhat excentric and prominent, abruptly twisted inwards : 

 whorls 8-9, compressed or shelving upwards towards the suture, 

 and moderately convex on the lower part ; the last occupies 

 about one-third of the shell : suture deep and slightly oblique : 

 mouth proportionally small, rhomboid- oval, contracted above, 

 wide, slightly expanded, and decidedly angulated below; length 

 scarcely exceeding one-sixth of the spire : outer lip gently 

 rounded, recurved on the lowermost of the 3 main spiral ridges, 

 by all of which it is notched or indented at the edge : inner lip 

 forming on the upper part of the pillar a thin film which is 

 united with the outer lip, on the lower part nearly straight and 

 not much reflected, terminating in a rectangular point : umbi- 

 licus wanting, or now and then represented by a minute and 

 narrow chink : tooth or fold none in any of the specimens (more 



