132 'Revieiv of (Recent (Jeological Literature. 
tidse, containing Diprltis (iiplodiscns Packard, 3, Bellinuridae -which con- 
tains thi-ee species distributed in two genera: namely, Prestzvic/iia dance 
Meek and Worthen, P. lougisfina Packard, and Bellinuriis hicori Vnckard. 
It will be observed that the author does not retain the genus Euproops 
of Meek and Worthern, but places the species referred to that genus under 
Prestwichia. 
Patieontologj is indebted to Dr. Packard, for his pains-taking work in 
determining the relationships of these peculiarly interesting Carbonifer- 
ous Crustacea. 
An article in Pall Mall (iazcfte written by Mr. J. A. Symonds describes 
the dangerous wind-blast that accompanies avalanches. Though of me- 
teorological rather than geological interest it brings into prominence an 
agent that may produce effects of importance in geology and we are 
therefore tempted to quote it. 
"The P'luela pass which connects us with the Lower Engadine is closed 
to traffic. Just before noon a man named Anton Broker, known among 
his comrades as, 'the Knave of spades' because he had a bushy black beard, 
was swept away by an avalanche. Eyewitnesses saw him carried by the 
blast together with his horse and sledge 300 yards through the air across 
the mountain stream. The snow which followed buried him. He w'as 
subsequently dug out dead, with his horse dead and the sledge beside 
him. The harness had been blown to ribbons in the air, for nothing 
could be found of it except the head-piece on the horse's neck." 
"The \iolence of the wind that precedes an avalanche is well authenti- 
cated. A. carter whom I know once told me that he was driving his 
sledge with two horses when an avalanche fell on the opposite side of 
the gorge. It did not catch him but the blast carried him and his horses 
and the sledge at one swoop over into deep snow whence they emerged 
with difficulty," " A road-maker was blown this winter in like manner 
into the air and saved himself by grappling a fir tree." 
" In order to understand the force of the Lawinen-Dunst as this blast 
is called here we must remember that hundreds of thousands of tons of 
snow are suddenly set in motion in narrow chasms. The air displaced 
before them acts upon objects in its Avay as breath blown into a pea- 
shooter." 
/// t//r ,^i/ar/. 'Joiirn. Grol. Spc., Pondon., Feb., iSSS, Dr. Henry Wood- 
■(vard describes a trilobite recently discovered in the great slate quarries 
of Col. Peurhyn, near Bangor, North Wales. He refers it to the genus 
Conocoryphe (C. viola). 
This discovery is of great interest because no fossils have previously 
been found in these quarries though millions of tons of slate have been 
taken out during the past half century; another illustration of the small 
value of negative evidence. It is also important because it adds another 
to the scanty fauna of the Lower Cambrian. 
The Lower Cambrian consists of the 
Harlech grits OOOn feet 
Llanberis slates ..,.» 3000 feet 
