150 



We are afTured by Mr. Donovan this was not only 

 amonq^ft Da Costa s (helis, wirh a note importing it to be 

 Englijb, but that it has alfo been recently difcovered near 

 Caithnefs, in Sroiland, by Mr. M'Leay. We have like wife 

 identified the fame fpecies from the Frith of Forth. 



It is not unfrequent amongft parcels of occidental fliells, 

 and has been confidered by fome as the Mammilla of LiN- 

 NiEUS, but it appears to be diftin6l. 



TuBEROSissiMA. Shell pellucid, white, with three or four volutious: on the 

 Tab. ^S. f. 5. body whirl are four elevations broken into tubercles ; the 

 upper volutions are very small : apex minute : umbilicus 

 large. Diameter one eighth of an inch, or ratlier more. 



The figure of this fhell was taken from a fpecimen in the 

 cabinet of Mr, Laskey, who took it by dredging in deep wa- 

 ter in the Frith of Forth. A fingle live fpecimen only oc- 

 curred. 



RuFA. Nerila rufa. Ginel. Syst. p. 3672 



Tab. 30. f. 3. Chem. Conch, v.t. 187. f. 1874—75. 



Nerita spadicea. Gmel. Syst. p. 3672. 



Chem. Coiwh. v. t. 187. f. 1872—73? 



Shell fmooth, gloiry,and of a livid-purplilTi colour, with a 

 white band round the top of the volutions, and two others on 

 the body whirl. Diameter more than half an inch. 



This 



