522 TROCHIDiE. 



above them are paler and more of a greenish yellow hue ; 

 the disk of the foot is pale tawny white, oval, rounded at 

 each extremity, finely and minutely fringed at the edges, 

 and marked with a groove down the centre. This groove 

 is conspicuous also in the foot of the preceding species. 

 The dentition appears slightly different from that of 

 cinerarius. 



This is a littoral shell, living on fuci and rocks, between 

 tide-marks and usually forming a zone above that of 

 cinerarius. Though very abundant wherever it occurs, its 

 distribution is peculiar, being confined to our southern 

 and western coasts. It does not appear to range north- 

 wards of the Hebrides, and is absent from the entire eastern 

 side of Great Britain. It ranges all round Ireland, and 

 is abundant on the shores of the Irish seas. Its southern- 

 most recorded foreign locality is Vigo Bay (M 'Andrew). 

 It is not known fossil. 



T. Magus, Linnaeus. 



Orbicular-conic ; whorls scalariform, nodulous above, with fine 

 spiral strips, and an inferior marginal belt ; umbilicus very large. 



Plate LXV. fig. 6, 7, and (Animal) Plate D D, fig. 3. 



Knorr, Delices des Yeux, pt 6, pi. 27, f. 4. 

 Trochus Magus, Linn. Syst. Nat. ed. 12, p. 1228. — Penn. Brit. Zool. ed. 4, 

 vol. iv. p. 127, pi. 80, f. 107. — Pulteney, Hutchins, Hist. 

 Dorset, p. 44. — Donov. Brit. Shells, vol. i. pi. 8, f. 1. — 

 Mont. Test. Brit. p. 283.— Maton and Rack. Trans. Linn. 

 Soc. vol. viii. p. 151. — Rackett, Dorset Catalog, p. 48, 

 pi. 16, f. 1, 2. — Turt. Conch. Diction, p. 186, f. 64.— 

 Fleming, Brit. Anim. p. 321. — Forbes, Malac. Monens. 

 p. 23, animal. — Brit. Marine Conch, p. 160. — Brown, Illust. 

 Conch. G. B. p. 17, pi. 11, f. 12, 15. —Born, Testae. Mus. 

 Caes. p. 330. — Chemn. Conch. Cab. vol. v. p. 101, pi. 171, 

 f. 1656, 1657, 1659 ; vol. xi. p. 163, pi. 196, f. 1886.— 

 Dillw. Recent Shells, vol. ii. p. 774. — Lam. Anim. s. Vert. 



(ed. Desh.) vol. ix. p. 130 Wood, Index Testae, pi. 28, 



f. 34. — Blainv. Faune Franchise, Moll. p. 280, pi. 10, a, 



