TROCHUS. 307 



(Brocchi) ; Sicily (Philippi) . Loven discovered it living 

 in the south-west of Sweden after the publication of 

 his ' Index ' : else all the foreign localities are southern, 

 and comprise the coasts of France, Spain, Portugal, 

 Italy, Greece, North Africa, Madeira, the Canaries, and 

 Azores, at depths of from 4 to 40 f., besides the Red Sea 

 (Forskal). 



The animal is beautifully and variously coloured, and 

 is tolerably active. Its prettily painted shell was the 

 " Sorciere " of D'Argenville. Under a rude and dull 

 exterior it has a thick layer of bright pearl, which is 

 brought out by the process called " cleaning." Such 

 improvements of Nature's work were placed by Scopoli 

 foremost in the Catalogue of his ' ' calamitates nobilis 

 scientise." Mr. Barlee used to be proud of showing his 

 fine collection of British shells, especially to young ladies, 

 until one of them innocently asked him if he picked them 

 up in the summer and polished them in the winter ! Very 

 young shells are equally convex on each side of the peri- 

 pheral keel, and the umbilicus is then very small. They 

 exhibit numerous fine longitudinal striae, which are 

 curved and not less conspicuous than the few spiral ribs 

 formed at that period of growth. A cancellated appear- 

 ance is the result ; and the sculpture is not unlike that 

 of Margarita cinerea, Couthouy. 



This is the T. tuberculatus of Da Costa. 



N? *<\\> 5. T. Tu'MiDus*,(Montagu.) ft 1 2- 



T. tumidus, Mont. Test. Brit. p. 280, tab. 10. f. 4. 4; F. & H. ii. p. 513, 

 pi. Ixv. f. 8, 9, and (animal) pi. D D. f. 2. 



BODY pale yellowish-white, transversely streaked with 

 brown or fine dark-purplish lines, which are sometimes 



* Swollen. 



