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. 



