= ee 
Mineralogy and Geology. 281 
described Canadian ones, but in others they acquire a greatly increased 
Size, occasionally twice the length and nearly three times the width, and 
the angle of divarication of the two branches varies from 5° to 70°, 
This is usually accompanied by the D. serratulus Hall, identical 
with those of New York slates, and generally also by the very large 
Canadian D: bryonoides Hall, which it is possible may be hereafter found 
to be the perfect development of my G. latus. The D. nitidus Hall 
is More rare, but perfectly identical with the Canadian types. The 
*xamples of the Australian and Canadian species; and further, that the 
European specimens are truly quadrifoliate, like Hall’s Phyllograptus ; 
aid in this way the difference in the different descriptions, as to the 
Width of the midrib, becomes intelligible. 
As a general rule, the graptolite slates in every part of the world con- 
ain no other fossils, I many years ago discovered in Wales, near 
Builth, the only shell I ever heard of in graptolite slates\(the Stphono- 
trela micula M’Coy), and I was greatly surprised to recognize it also in 
“e Deep Cree 
n ymeno- 
me represented by a new species, H. Salteri M’Coy, found in most 
the graptolite slate localities. : 
, i a different set of sandy, marly, and mud-stone beds—as at Woori 
ei Yarra—we find an extensive series of the genera and many of 
eyric tagonia depressa aes 
this elegantula, the cputechesialiastiiala genus Cucullella, Murchisonia, 
5 ularia, &e.; and some species new, and some identical with British 
ao Nine of remark, that as on the continent of Europe the Devonian genus 
tre gd er tpt eno ; so in paper gs" oie ary 
Tiind a new species (P. meyastoma, M’Coy), with cells half an inch in diameter 
AM. Jour. Sc1.—Sxconp Sexies, VoL. XLIV, No. 131.—Sspr., 1967, 
36 
