NATICA. 335 



No coloured markings adorn its exterior, which is of an 

 uniform chestnut or livid hue, except near the anterior ex- 

 tremity, where it becomes white or pallid as in nitida. 

 The umbilicus is large, and rather open-mouthed. The 

 callus of the inner lip is much thickened, though not very 

 broadly spread, and as well as the pad and the outer edge 

 of the columella is stained with pale chocolate. The oper- 

 culum is brown. An inch in breadth, and rather more than 

 an inch in length are the dimensions of an adult specimen. 



The animal, which we have been so fortunate as to take 

 in full vigour in the seas of the outer Hebrides, is of a 

 general dusky tawny hue, deeply tinged with madder 

 brown. The mentum is very large ; its anterior lobe is 

 the most darkly coloured portion of the body ; its reflexed 

 lobe is lighter and yellowish at its margins ; the angles are 

 rounded but well marked, and the centre slightly emargi- 

 nate. The sole of the foot is reddish tawny. The ten- 

 tacula are rather broadly lanceolate, of a pale but dusky 

 reddish white hue. Philippi's note of the colours of the 

 animal of Sicilian specimens sufficiently agrees with our 

 observations of a British example. The operculum is pale 

 and corneous, with a remarkable pearly lustre at its 

 margins. 



This species was exhibited at the York meeting as pro- 

 bably new to Britain, by Mr. M'Andrew, who dredged it 

 first in St. George's Channel, in sixty fathoms water, be- 

 tween Scilly and the Smalls ; he afterwards took it 

 between Cape Clear and Baltimore, in thirty fathoms 

 water, and off Arran in Scotland, in twenty-five fathoms ; 

 also dead in ninety fathoms at the Zetland Isles. The 

 example, of which we have examined and described the 

 animal, was taken with several dead specimens in the Bay 

 of Stornoway in Lewis, in twenty fathoms water. Mr. 



