246 CANCELLARIID.E. 



trernely short, and widely open : snout short, deeply bilobed, 

 placed between the tentacles so as to keep them far apart : ten- 

 tacles rather long and tapering, with blunt tips, much thicker on 

 the lower third portion : eyes small and black ; stalks about 

 one-third the length of the tentacles : foot thick and narrow, 

 rounded and double-edged in front, with a small triangular 

 Lobe at each corner, angulated and wedge-shaped behind. 



Shell turreted, somewhat spindle-shaped or pointed at each 

 end, with the base much shorter than the apex ; it is solid, 

 opaque, and lustreless : sculpture, several spiral cord-like 

 ridges or ribs, of which 3 or 4 on the body-whorl, and 2 on 

 each of the upper whorls are the strongest and most promi- 

 nent ; between these are smaller ribs, viz. 3 between the suture 

 and the uppermost of the principal ridges on the body-whorl, 

 1 between that and each of the next two or three ridges, and 

 4 or 5 between the lowest ridge and the basal peak .; the whole 

 surface is also covered with microscopic spiral lines ; besides 

 the spiral sculpture the shell is closely and obliquely traversed 

 lengthwise by line thread-like striae, so that the crests of the 

 ridges and smaller ribs are delicately beaded : colour whitish, 

 sometimes tinged with reddish-brown : epidermis pale yel- 

 lowish-brown, forming thorn-like points or bristles on the 

 crests of the principal ridges; these bristles are sometimes 

 double : spire considerably elongated and finely pointed : ivlwrls 

 7, moderately convex, but having a sharply angulated appear^ 

 ance, owing to the prominence of some of the spiral ribs ; the 

 last occupies seven -twelfths of the spire (viewed mouth down- 

 wards), and is somewhat dilated ; top whorl smooth and 

 glossy, twisted upwards : suture deep, channelled between the 

 lower two or three whorls but not between the upper ones : 

 mouth inversely pear-shaped, somewhat expanding outwards, 

 not much more than half the length of the spire ; inside white, 

 pale orange, or yellowish-brown ; the basal groove is angular, 

 but not indicated by any notch in the outer margin : outer lip 

 rounded, incurved on the periphery, with thin and scalloped 

 edges, and fringed by the epidermis ; the inside, or throat of 

 the mouth, is grooved beneath the spiral ridges : inner 

 lip nexuous, broad, and reflected on the pillar, to which it is 

 for the most part attached : pillar also flexuous, having near 

 its base a blunt fold, which extends obliquely upwards along 

 the spire ; below this fold is the short siphonal canal: umbi- 

 licus small, narrow, and curved : operculum obliquely oval, 

 with a pointed termination, yellowish-brown, composed of 



