On the Fructification of Peyssonnelia Squamaria. 155 loured bands as in the preceding varieties, though, from imperfect indications of them in one or two instances, it is not improbable that this variety may occasionally assume the markings of the deep-water shells* ; the mouth is rarely white, most frequently of a deep rich purple-brown, occasionally tawny or of a fine bright yellow, particularly when the shell is white or pale. A very interesting modification of this variety occurs on the Lancaster Sands, where it was procured in abundance by Mr. Charles M. Adamson. The undulations of this form are scarcely to be distinguished, and in many individuals are completely oblite-rated ; the striae are generally very strong and regular, with finer striae between them, giving the surface precisely the appearance of i^. striatum of Pennant; the surface is however occasionally devoid of the more elevated striae, and is closely covered with fine but somewhat irregular stria3. Another striking modification of this variety was taken by the Rev. J. Law on rocks near Sunder-land : it is white with a bright yellow mouth, having the surface well undulated and the striae strong and much elevated. Dr. Johnston mentions in the ' Proceedings of the Berwickshire Naturalists' Club,^ a shell with a purple mouth that occurs in Berwick Bay, which probably belongs to this variety ; and the B. undatum of Gould^s ^ Invertebrata of Massachusetts ' appears also to resemble it. The golden-coloured mouth of the American shell, and its locality, which is stated to be ^^ on the rocky bars in Boston harbour," go far to prove that it belongs to this form. Professor Edw. Forbes also mentions in his ' Malacologia Mo-nensis ' a dwarf form of this variety as occurring near Bergen in Norway, and in the Firth of Forth. With these three exceptions, this strongly^marked variety appears to have escaped the notice of writers on the subject. Newcastle-on-Tyne, January 26, 1847. XVIII. — On a second form of Fructification in Peyssonnelia Squamaria. By C. Montagne, D.M., in a Letter to the Rev. M. J. Berkeley, M.A., F.L.S. I TOLD you in my last letter of a new form of fructification which I had just discovered in a specimen of Peyssonnelia Squamaria from Algiers, I propose at present to trace the history of this discovery, to describe these new organs, and to subjoin some brief notes on Nemathccia. In studying the Fungi collected by Prege at the Cape which had been placed in my hands by Professor Miquel of Amsterdam, I found under the number 4108 (44) a specimen of Peyssonnelia * Slnoe writing the above, Mr. llichard Howse has informed mo that lie has recently taken this vuriety with coloured bauds.
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