TROCHUS. . r )0. r > 



T. exiguus, Pulteney. 



Small, conic, imperforated ; whorls with a prominent mar- 

 ginal belt, above which are a few finer spiral costellre that are 

 not simple ; the interstices obliquely traversed by longitudinal 

 raised lines ; apex rosy. 



Plate LXVI. fig. 11, 12. 



Trockus exasperates, Pbnn. Brit. Zool. ed. 4, vol. iv. p. 126. — Fleming, Brit. 

 Anim. p. 323. 

 „ minutus, §c. Chemnitz, Conch. Cab. vol. v. pi. 162, f. 1529 (probably). 

 „ exiguus, Pulteney, Hutchins, Hist. Dorset, p. 44. — Mont. Test. Brit, 

 p. 277. — Maton and Rack. Trans. Linn. Soc. vol. viii. 

 p. 156.— Rack. Dorset Catalog, p. 48, pi. 21, f. 4. — Turt. 

 Conch. Diction, p. 190. — Brit. Marine Conch, p. 163. — 

 Brown, Illust. Conch. G. B. p. 19, pi. 11, f. 27, 28.— Wood, 

 Index Testae, pi. 29, f. 91. 

 Trockus comdus, (not Linn.) Da Costa, Brit. Conch, p. 40, pi. 2, f. 4. — 

 Donov. Brit. Shells, vol. i. pi. 8, f. 2. 

 „ minutus, Dillvv. Recent Shells, vol. ii. p. 797. 

 „ crythroleucus, Lam. Anim. s. Vert. (ed. Desh.) vol. ix. p. 151. — 



Hanley, Conch. Book of Species, p. 70. 

 „ interruptus, Wood, Index Test. Suppl. pi. 6, Troch. f. 42? 



The name exasperatus was attributed to this species by 

 Pennant, but was merely applied by him to the delineation 

 of a shell which was otherwise unknown to him. On the 

 same principle that we object to Gmelin's habit of indiscri- 

 minately bestowing Latin appellations upon all engravings 

 of zoological subjects that he could not distribute among 

 the ascertained and characterized species, we have here 

 repudiated the prior name of an undefined shell. 



In our British specimens, the shell is simply conic, but 

 varies considerably in the relative proportions of its length 

 and base ; the lateral outlines are more or less rectilinear. 

 It is tolerably strong, opaque, but little shining, and ranges 

 in colour from tawny, or ashy fulvous brown, or olivaceous 

 fulvous, to crimson red. In all cases, however, the apex, 

 which is very small, and more or less acute, is invariably 



vor.. n. 3 t 



