TROCHUS. 495 



Abroad it ranges from Norway to the Mediterranean. As 

 a fossil it first appeared in our area during the coralline 

 crag epoch. 



T. conulus, Linnaeus. 



Resembling zizyphinus, but combining smoothness and flat- 

 ness of volutions, with a purely conical figure, and a rectilinear 

 lateral outline. 



Plate LXXIII. figs. 1, 2. 



Bonanni, Recr. pt. 3, pi. 93. 

 Trochus conulus, Linn. Syst. Nat. ed. 12, p. 1230. — Brit. Marine Conch, p. 255. 

 — Dillw. Recent Shells, vol. ii. p. 988. — Woon, Index 

 Testae, pi. 29, f. 93. — Lam. Anim. s. Vert. (ed. Desh.) 

 vol. ix. p. 142. — Payraud. Cat. Moll. Corse, p. 125. — 

 Philippi, Moll. Sicil. vol. i. p. 175, and vol. ii. p. 149, 

 var. a. 

 „ %c. Chemn. Conch. Cab. vol. v. pi. 166, f. 1588. 



The synonymy of this elegant Troclms, might have been 

 much increased, had we possessed more leisure to investigate 

 its exotic varieties. It was only, however, just previous to 

 transferring this page from our own hands, that we were 

 induced by a letter from our friend Mr. Bean, to include 

 the species among our native shells, since neither Pennant's 

 nor Turton's conulus present the characteristic features of 

 the species. The individual delineated in our engraving, 

 was, we are assured by that gentleman, taken alive by his 

 son, on a voyage from Newcastle to London. " The man 

 was heaving the lead, somewhere on this (the northern) 

 side of the Lincolnshire coast, when this shell adhered to 

 it. I had the pleasure of extracting the animal. " 



The specimen alluded to, which is not a typical or pecu- 

 liarly characteristic conulus, is conical, moderately broad, 

 and with its lateral outlines nearly straight or barely sub- 

 retuse. It is tolerably strong, not transparent, and of a 



