<J6 Mr. Thompson on the Mollusca of Ireland, 



This very beautiful species, which is admirably described 

 by Savigny, I have found much more common in the north 

 of Ireland than the B. Schlosseri ; it occurs chiefly on the 

 leaves of Lamiaaria digitata. The Adriatic Sea and the 

 Manche are the localities whence Savigny procured it. What 

 Delle Chiaie figures as a variety of this species, tab. 36, fig. 9, 

 has occurred to me as commonly as the ordinary state. 



Sydneum turbhiatum, Sav. Mem. p. 239. 



I once procured this in Strangford lough ; and by Dr. J. L. 

 Drummond it has since been found in Belfast Bay. 



In the Magazine of Nat. Hist., vol. vii. p. 129, et seq., two 

 Ascidicc are figured and described as new by " C. M.," — a 

 signature adopted by my friend Robert Templeton, Esq., 

 Roy. Art., in this and another communication in the same 

 vol. p. 10. To the first, Asc. gemina, no habitat is given, 

 but the entrance to Strangford lough may be mentioned as 

 one, as 1 have found the species there, adhering to the sub- 

 merged rocks. The Asc. anceps is perhaps not distinct from 

 Asc. prunum. 



INVERTEBRATA MISCELLANEA. 

 Mollusca. 

 Ianlhina nitens, Menke.? Philippi Enum. Moll. Sicilian, p. 

 164. tab. 9. fig. 16. ? I. pallida, Harvey MS. PI. II. fig. 2. 



This Ianthina, of which a number of specimens were found 

 some years ago by my friend W. H. Harvey, Esq. (the well- 

 known botanist) at Miltown Malbay on the coast of Clare, 

 is very distinct from the two known British species, I.fra- 

 gilis and I. exigua, and was named I. pallida by Mr. Harvey; 

 whether it be really a nondescript species is difficult to be 

 determined. The nearest approach I find to it is the I. ni- 

 tens, Menke, as described and figured by Philippi in his 

 excellent 6 Enumeratio Molluscorum Sicilian/ but from this 

 it differs in the columella being curved so as to present a 

 somewhat rounded appearance, instead of being straight ; the 

 lanthincB, however, are subject to considerable variety. With 

 the exception of this character, it agrees well in form with 

 the I. prolongata, Blain., figured in Payraudeau's f Moll, de 

 Corse •/ but the colour of this, (dark blue,) is very different 



