528 TROCHID^E. 



having a white or yellow tubercle at the base of each. The 

 sides of the foot are greenish yellow, marked with dark 

 close-set interrupted lead-coloured lines, mingled with fine 

 yellow opaque dots. The disk of the foot is oval, moderately 

 elongated, rounded at both ends ; grooved medially and 

 anteriorly, of a dusky drab colour, with fine anastomosing 

 yellowish white lines, and a fine light drab fringe at the 

 edge. This account of the animal is extracted chiefly from 

 the notes of Mr. Clark. 



The range of this species is south-western and western. 

 It inhabits the Channel Isles (S. H.) ; is frequent on the 

 Devon and Cornish coasts, and along the southern and 

 western shores of Wales. It is found round the southern, 

 eastern, and western coasts of Ireland, extending north- 

 wards as far as 54^° N. lat. (Thompson). It is a littoral 

 shell, always found between tide-marks. Mr. Jeffreys has 

 a monstrosity, found at Exmouth by Mr. Clark, in which 

 the operculum is irregularly spiral. It is not known as a 

 British fossil. It ranges along the south-western coast of 

 Europe. 



T. undulatus, Sowerby. 



Small, of an uniform pink or flesh-colour, not variegated ; 

 whorls with subsutural longitudinal undulations, and in general 

 with spiral costella?, but no marginal belt : rather a large umbi- 

 licus. 



Plate LXVIII, fig. 1, 2, and Plate LXXIII, fig. 5, 6. 



Margarita striata, Leach, in Appendix to Ross's Voyage to North Pole (inade- 

 quately defined ; but from types). — Gray, Zoolog. Journ. 

 vol. ii. p. 567. 



Turbo corneas, Lowe, Zoolog. Journ. vol. ii. p. 107, pi. 5, f. 12, 13. — Brit. 

 Marine Conch, p. 170. 



Margarita carina, Sowerby, Malacolog. Magaz. p. 25 ; Conch. Illust. Marg. 

 f. 9. — Brit. Marine Conch, p. xxxvii. — Brown, Illust. 

 Conch. G. B. p. 17, pi. 10, f. 36, 37. 



