TROCHUS. 



499 



appressed to the shell. The operculum is very pale 

 horn-colour. The foot is very broad oblongo-triangular, 

 truncated in front with produced and mucronated angles. 



This beautiful sj^ecies was first taken in the British sea, 

 in 1846, in fifty fiithoms, among stones on the Ling banks 

 off Zetland, and in from forty-five to sixty fathoms off Fair 

 Island (M'Andrew and E. F.). It has since been taken 

 by Mr. Jeffreys at thirty miles east of Lerwick. Mr. 

 Barlee has taken it in the same region, and Lieut. Thomas 

 has dredged it on a stony bottom in sixty fathoms off 

 Troup Head, Aberdeenshire, and in forty to eighty fathoms 

 on both sides of the Orkneys. Duiing the same year it was 

 briefly characterized by Loven, under Beck's MS. name 

 of Margarita alahastrum, and recorded as ranging from 

 Bergen to Finmark, on the Scandinavian shores. Should 

 it prove the T. occidentalis of North America, as judging 

 from the description we think likely enough, that name 

 must be substituted for Beck's. It appears to be an Arctic 

 form. It is found fossil in both coralline and red crags 

 (Searles Wood). 



T. GRANULATUS, Bom. 



Whorls with numerous fine granulated or corded spiral cos- 

 tellee ; base rounded, imperforated. 



Plate LXVII. fig. 7, and pi. LXVIII. tig. 2 ; Animal, pi. DD. f. 4. 



Trochus jMp'dlosus, Da Costa, Brit. Conch, p. 38, pi. 3, f. 3 (probably). — 

 DoNov. Brit. Sliells, vol. iv. pi. 127. — Mat. and Rack. 

 Trans. Linn. Soc. vol. viii. p. 155. — Rack. Dorset Catalog. 

 p. 48, pi. 16, f. 6. — TuRT. Conch. Diet. p. 190, f. 62. — 

 Fleming, Brit. Anim. p. 323. — Forbes, Malac. iMonens. 

 p. 22, animal. — Brown, Illust. Conch. G. B. p. 19, pi. 11, 

 f. 13, 14.— DiLLW. Recent Shells, vol. ii. p. 800.— Wood, 

 Index Test. pi. 29, f. 95. 

 „ ffranuhius. Born, Test. Mus. Cses. Vind. p. 337, pi. 12, f. 9, 10. — Brit. 

 Marine Conch, p. 162. — Lam. Anim. s. Vert. (ed. Desh.) 



