I am indebted to Mrs. Bolton, of Storr's-hall, Windermere, for the loan of this and several other rare shells: it formerly belonged to Mr. Jennings, and appears an old shell, being heavy in proportion, the umbilicus thickly closed up, and the outer-lip very thick. Another I have seen at Mrs. Mawe's, and one is in the British Museum: but the finest specimen in colour and preservation is in the possession of my friend W. J. Broderip, Esq., of Lincoln's-Inn: from this it seems the spiral whorls are finely and delicately marked by transverse elevated striae, while those on the basal volution are striated transversely, though in a less regular manner. Bruguiere mentions that this species is generally found in the South American islands, Cayenne, and Guiana. Mr. Dillwyn has given the new name of _aurea_ to this shell, in addition to the five others under which different authors have described it. Such changing of names and multiplication of synonyms, without strong reasons, are very objectionable. I have retained that of _Bruguiere_, as being the only author who has placed it in its proper genus. * * * * * Pl. 47 [Illustration] BULIMUS citrinus (_var_. perversu). _Reverse, banded Citron Bulimus._ * * * * * GENERIC CHARACTER.--See Pl. 4. * * * * * SPECIFIC CHARACTER.--See Pl. 46. SYNONYMS. _Martini, vol._ 9. _tab._ 934 & 5. _Knorr_, 4. _tab._ 28. _fig._ 4, 5. (bad.) Bulimus citrinus, _var._ B. _Bruguiere_, 314. 27. * * * * * A fine pair of this beautiful and rare variety is in the collection of Mr. C. Dubois, to whom I am indebted on this and many other occasions, for the facilities he has afforded me in prosecuting the present work: one of these is now figured; it differs in no respect from that in the last plate, except in being reversed and having the umbilicus not so completely closed; a character which, perhaps, exists only in very old shells. The other specimen is also reversed and banded, though in a different manner. * * * * * BULIMUS aureus. _Golden Bulimus.--upper and lower figures._ SPECIFIC CHARACTER. _B. testa obovata, spira conica, anfractibus 5 convexis, sutura simplici, umbilico aperto._ Shell obovate; spire conic, of five convex volutions; suture simple; umbilicus open. _Lister_ 34. 33. _Martini_ 9. _tab._ 110. 928. 929? OBS. BULIMUS _aureus_, in Mr. Spurrett's valuable cabinet is another specimen of this shell minutely agreeing with that here described. * * * * *