in 



might be in a dead and worn fpecimen, but in recent 

 fhells that part is of a fine pearlaceoushue. Poffibly fome 

 variety of this fpecies may be umbihcated, as in fome fpe- 

 cimens we have {&tw a flrong inclination towards it. Da 

 Costa received his from Corniuall, but fays, lie never 

 met with it from any other BriUjli coaft. 



Not T.fragilis of Gmelin ; have therefore not adopted 

 D'o61or Pulteney's name, which at the time of writing 

 he had probably overlooked the circumltance of its being 

 preoccupied for a different fliell, 



3. 

 Trochus cxiguus. Pult. Cat. Dorfet. p. 44. E?;iguus. 



Lifter. Conch, t. 616. f. 2. 

 Trochus exafperatus. Br. Zool. No. 105. 

 Trochus Conulus. Da. Cofta. p. 40, t. 2. f. 4. 4. • 



Don. Br. Shells, i. t. 8. f. 2. 

 Trochus cry throlciicos. Ginel. Syft.p. 35 SI ? 



Turt. Lin. iv. p. 473 ? 



Chcm. Conch, v. t, 162. f. 1529. a. b. 



T. with a ftrong conic (hell, with fix volutions, termi- 

 nating in a fine point; each volution wrought with four 

 or five fmall, fpiral, crenated ridges : the wreaths defined 

 by a broad, and more elevated ridge, finely cut diagonally 

 with ftrias, or notches, that give it the appearance of 

 twifted cord ; the inrerfiices between the ridges, are very 

 finely ftriated in the fame direftion : colour various, cine- 

 reous-brown, or purplifii : the larger ridge frequently red, 



and 



