304 



toreus, and that in an obfolete manner; add to this, the 

 llrength of the fliell feems to indicate its being formed and 

 full grown: befides it is to be remarked, that no interme- 

 diate fizes are to be found of the fame colour and fhape, 

 except from the tenth of an inch to one quarter. 



We muft however remark, that fome of thefe littoreal 

 fliells are by no means eafily afcertained in the pullus or 

 fry (late; and, indeed, fome of them in the more advan- 

 ced flages are not readily identified. 



The aperture of this (hell is guarded with a corneous 

 operculum, like that of the littoreus. 



"When we confider the vaft variety the T. littoreus is 

 fubje6l to in different Ilages of growth, it is but right to 

 acknowledge, that there is no fmall difficulty in determin- 

 ing what are really belonging to that fpecies, amongftthe 

 littoreal (hells of our coafls; the fliades and gradations are 

 fo intimately blended, that it is fcarce poffible to deter- 

 mine what marks a chara6ieriftic line of divifion. 



12. 

 j^ujjig^ Turbo rudis. Do;;. Br. Shells, i. t. 33. f. 3. 



Turt. Lin. iv. p. 480. 



Chem. Conch, v. t, 185. f. 1S53.. 



T. with a thick, ftrong fhell, with five ventricofe volu- 

 tions, well defined by a feparating line; and fometimes 

 faintly marked with fpiral itriae, moll confpicuous at the 



bafe : 



