780 TROCHUS. 



Trochus lineatiis. Da Costa Brit. Conch, p. 43. t. 3. f. 11 

 and IG. Maton and Racket, in Lin. Trans, viii. p. 152. 

 Dorset Cat. p. 48. t. l6. f. 11 and 12. 

 La Livree. Favanne, ii. p. 121. t. 8. f. I 2. 

 Lister Anim. Ang. t. 3. f. 15, and Conch, t. 641. f. 31. 



Inhabits the Mediterranean, and coasts of Norway, LinncEus. 

 Britain. Lister, i<c. France, England, Provence, St. Do- 

 mingo, and Martinique. Favanne. 



Shell about live-eighths of an inch long, and equally broad, of 

 a pale ash-colour, marked with fine approximated purplish 

 brown rays ; the umbilicus is deep and narrow. T. cinera- 

 riiis of Born is different, and is the T. albidiis of Gmelin. 



NERITOIDEUS. 50. Shell sub-ovate, convex, de- 

 pressed, smooth, glabrous, and of a reddish 

 colour. 



Trochus neritoideus. Olaffsen Isl. No. 1015. Gmelin, p. 

 3577. 



Trochus helicinus. Fabricius Fauna Groenl. p. 393. 

 Inhabits the coasts of Greenland, frequent. Fabricius. 

 This shell is said to be only two lines long, and allied to T. ci- 



nerarius, but of a reddish colour ; the animal which inhabits 



it is bluish black. 



ALBiDus. 51. Shell ovate-conical, with the whirls 

 transversely striated, and the sutures chan- 

 nelled ; aperture roundish, and the umbilicus 

 nearly closed. 



Trochus albidus. Gmelin, p. 3576. Schreibers Conch, i. 

 p. 250. 



Tro<hus cinerarias. Born Mus. p. 330. t. 11. f. 19 and 20. 



Trochus, No. 175. Schroeter Einl. i. p. 746. 



Inhabits 



Born describes this species to be five lines long, and six broad, 



with seven whirls, and white, marked with undulated oblique 



black stripes. 



viTTATUS. 52. Shell convex, sub-umbilicated, of 

 a pale chestnut colour, with a red and white 

 spotted transverse band below the sutures. 



Trochus vittatus. Gmelin, p. 3375. Schreibers Conch, i. 

 p. 247. 



