LACUNA. 349 



with purplish-brown), or uniform pale yellow : mantle thick, 

 fleshcolour : head broad, projecting beyond the foot, pale red 

 or edged with greenish-brown : tentacles white, ribbon-like, 

 with blunt tips and jagged edges : eyes rather large : foot 

 thickened, opaque, of a dusky hue towards the sides, double- 

 edged in front, narrower or contracted in the middle, and end- 

 ing in a minute bluntly pointed tail ; sole irregularly bor- 

 dered with white, and divided down the middle by a slight 

 groove : appendages small and flattened, like miniature ten- 

 tacles. 



SHELL globular, slightly expanded at the base, with an an- 

 gulated periphery, rather solid, opaque and glossy : sculpture 

 similar to that of the two foregoing species, usually not so con- 

 spicuous or regular as in L. divaricata ; the present species has 

 frequently also numerous slight strise in the line of growth : 

 colour J^llowish-white with the upper whorl sometimes pur- 

 plish, dull reddish-brown, or whitish with three rufous bands 

 on the body-whorl, the middle one of which is much broader 

 than either of those which encircle the upper and lower part 

 of that whorl ; the colour when uniform, and the bands when 

 present, are of various shades and degrees of intensity ; occa- 

 sionally the uppermost band is continued on the penultimate 

 whorl : epidermis membranous and thin : spire scarcely raised, 

 but prominent, terminating in a blunt point: whorls 3-4, 

 convex, the last occupying about four-fifths of the spire : suture 

 rather deep : mouth slightly expanded outwards and below, and 

 more or less angular at the base : outer lip very thin, incurved 

 towards the pillar : inner lip slight, not united with the outer 

 lip, but spread over the base above the canal, which it partly 

 covers : pillar white ; canal generally wide and forming a deep 

 excavation in the base of the shell, so as to expose nearly all 

 the interior of the spire : inside polished, of the same colour 

 as the outside : operculum resembling in every respect those of 

 L. crassior and L. divaricata. L. 0-2. B. 1-5. 



Yar. 1. conica. Banded, rather thin, and having the spire 

 longer than usual. 



Yar. 2. auricularis. Light horncolour or dirty white, 

 thin and transparent. Turbo auricularis, Mont. Test. Brit, 

 p. 308. 



Yar. 3. lactea. Milk-white and solid. 



Yar. 4. clausa. Base of the shell pointed ; pillar not exhi- 

 biting any canal or excavation. 



