402 



that opinion, as this fliell is not uncommonly confidered 

 as fuch, by collectors. 



It was figured in Triton Britannicus,'^ where we ob- 

 ferved that name affixed to it, and which the Doclor al- 

 fo refers to. 



In quoting Da Costa we confefs, it is more from 

 popular opinion than from our own, if his defcription is 

 to be attended to : the fmooth variety of this fliell is, 

 indeed, when worn and bleached, milk white, gloffy, and 

 the fpires are nearly level, or not prominent beyond one 

 another, only feparated by a flight furrow. To this 

 part, therefore, of Da Costa's defcription it would in 

 that ftaie fomewhat accord : but we cannot conceive, 

 how it could be placed in the genus Sirombiformis, or 

 Needle Snails, of that author, the charafters of which 

 are "very long, flender, and taper in fliape." In his 

 fpecific defcription, however, he fays, "of a taper fhape, 

 "not flender, but very fwelled, or bodied." 



The Turbo viembranaceus of Mr. Adams, we have 

 ver>' little doubt, is the lineated variety of this fhell, 

 which is not unfrequently met with, exadly (forrefpond- 

 ifig with the defcription given bv that gentleman, except 

 in the number of fpires, v,hich is known to vary with 



age: 



* An intended work on Concholog}' with this title, never appeared btfore 

 #.ie public: Doflor Pulieney quotes it as a M. S. and informs us, it is a 

 aew irnpreflion of Da Costa's plat£s, withieven additional tables. 



