On the Verrucarie found in Lombardy. 183 
of the Speeton Clay*, and either that this latter bed in its 
newest part represents the Shanklin Sands, while the Red Rock 
represents the Gault and Upper Greensand, or that the Red Rock 
is Upper Greensand, and that the upper part of the Speeton 
Clay is Gault. There is no other alternative. Now, as the Clay 
deposit was (as is admitted on all hands) continued through the 
Shanklin-Sands period at Speeton, very much more would it be 
continued through the Gault period, which was but a return to 
the geographical conditions of the Kimmeridge Clay. So the 
Speeton Clay must, in its upper part, be Shanklin Sands and 
Gault ; and the Red Rock can only be Upper Greensand, as its 
fossils indicated. 
I had hoped to give some indications of the subsequent his- 
tory of these fossil species after they disappeared before the en- 
croaching Chalk ; but as soon as may be those remarks willappear, 
in a lecture given before the Yorkshire Philosophical Society in 
December 1864, “On the Origin of the Superposition and 
Sequence of British Strata, and the Laws which have determined 
the Distribution of Life in Space, through Time, up to actual 
Nature.” 
XXI.—Notule Lichenologice. No. III. 
By the Rev. W. A. Leicuron, B.A., F.L.S. 
By the generous liberality of Prof. Santo Garovaglio of Pavia, 
Italy, I have been favoured with a copy of his‘ Tentamen Disposi- 
tionis Methodicee Lichenum in Longobardia nascentium,’ 4to, 
Mediol., 1865. Of this elaborate work only a portion has been 
as yet published, containing the unilocular and bilocular spored 
Verrucarie. It is the result of a very comprehensive examination 
of specimens ina living state and in their native localities, and also 
of allthe published collections since the time of Acharius, as well 
as of extensive collections in his own herbarium and those of many 
continental lichenologists. The work is illustrated with five 
large plates of microscopical details most carefully prepared by 
his learned coadjutor, Dr. Joseph Gibelli, and is to be accompanied 
with actual specimens so far as practicable. 
The Professor limits his genus Verrucaria to those angiocarpous 
Lichens which have a simple homogeneous nucleus, with a car- 
bonaceous black epithecium and a crustaceous thallus, thus exclu- 
ding all those whose thallus is foliaceous or squamose, which have 
been comprised in the genus by the celebrated Dr. W. Nylander 
and others. 
He regards the spore and the number of its cells as furnishing the 
* Geological Magazine, No. 12, p. 262, &e. 
