302 



ridges which terminate inwards in small tubercles, and out- 

 wards in points, giving a scalloped appearance to the outer 

 edge ; some of these ridges are double or arranged in pairs : 

 inner Up forming a polished glaze, which is thicker on the 

 outside of the canal : pillar broad, furrowed across with nu- 

 merous plaits or narrow ridges, the uppermost of which is the 

 largest, and the lowermost are sometimes broken or inter- 

 rupted; there is a smooth space between the top plait and 

 the upper corner of the mouth : operculum obliquely oblong, 

 horncolour, rather solid; layers of growth slightly imbri- 

 cated or overlapping one another. L. 6. B. 2-75. 



HABITAT : Guernsey coast, where three living speci- 

 mens were trawled at different times between 1825 

 and 1832. Two were procured by Mr. Lukis (who 

 kindly presented one of them to me) , and the third by 

 Sir Thomas Mansell: the largest was taken near the 

 Caskets, by James Ozanne of Paridis Vale, on the 25th 

 of August 1825. Mr. Lukis kept this specimen alive 

 for some time. I was assured both by him and Mr. 

 Gallienne that the Guernsey fishermen trawl only within 

 a short distance from their own land, and never go on 

 the opposite coast of France, and that French trawlers 

 never come to the Channel Isles. Fossil at Piacentino 

 (Brocchi) and Palermo (Calcara, ?Philippi). It in- 

 habits the North Atlantic from Brest (Freminville, fide 

 Collard des Cherres) to the Azores (Drouet) , both sides 

 of the Mediterranean (Lamarck and others), the Adri- 

 atic (v. Schrockinger), and Archipelago (Linne). 



It seems to have the same faculty as the snails and 

 slugs for reproducing amputated parts. Madame Power 

 lopped off a tentacle ; and at the end of 20 days a new 

 one had been formed, six lines in length ; previously to 

 amputation it measured fourteen lines. According to 

 Philippi, the animal, shortly before death, emits a fluid 

 which he calls " pulcherrime ccelestem." The Sicilian 

 fishermen not only use the shell as a trumpet, but eat 



