[88] According to the letter of the Rules of the British Association, Ellis's name ought to be retained, as it was published in 1758, the same year during which the 10th edition of the 'Systema Naturæ' appeared, in which edition the binomial method was first used. But as Ellis himself did not then know of, or follow this method, it might be disputed whether, according to the _spirit_ of the law, his name ought to stand. The only other name given to this species is that of _tulipa_, affixed by Poli in 1791, but this name had been previously used by Müller in 1776, and by Chemnitz in 1785, for another species, the _B. Hameri_ of this work; and likewise, also previously to Poli, by Bruguière in 1789, for still another species, viz., _B. tintinnabulum_ of this work: under these complicated causes of confusion, I think it is highly advisable to adopt Ellis's name. I may add that the _B. tulipa_ of Mr. G. B. Sowerby is the _B. tintinnabulum_ of this work. It is possible that the _B. conoides_ of Brown, 'Illustrations Conch.' (1st edit. pl. 6, fig. 7), may be our present species; but without details of structure it is hardly possible to identify, in many cases, the species of Balanus. _Shell dark rose-coloured, sometimes tinged with purple; orifice toothed. Scutum externally very smooth, covered by membrane. Tergum with distinct crests for the depressor muscles._ _Hab._--Sicily, Malta, Malaga, (associated with _B. perforatus_), Madeira. Often growing in clusters and associated with _Pachylasma giganteum_. Attached to _Millepora aspera_, oysters, and other shells. According to Poli, an inhabitant of deep water; yet in mus. Cuming there are two fine specimens attached to the always floating _Lepas anatifera._ Mus. Lowe, Macandrew, Stutchbury. _General Appearance._--Shell tubulo-conical or conical: orifice large, toothed, approaching to pentagonal. Surface moderately smooth, naked. Colour rosy, or tile-red, with a slight tinge of purple; or beautiful rich purple. Radii nearly as dark as, or darker than, the parietes. The portion of the alæ seen externally is generally white. Internally the whole shell is nearly white. Generally the tints outside vary in transverse fasciæ; sometimes there are very fine, dark, longitudinal lines. Largest specimen (from Malta), 1.4 of an inch in basal diameter; usually full-sized specimens are about three quarters of an inch in basal diameter.