Origin of Species Variorum

→ M. Barrande not long ago 1866

M. Barrande has lately 1859 1860 1861

Not long ago M. Barrande 1869

Not very long ago M. Barrande 1872

→ to the Silurian system, 1859 1860 1861 1866

OMIT 1869 1872

→ species. 1859 1860 1861 1866

species beneath the old Silurian system. 1869

species, beneath the then known Silurian system; and now, still lower down in the Lower Cambrian formation, Mr. Hicks has found in South Wales beds rich in trilobites, and containing various molluscs and annelids. 1872

→ several forms have 1866

life have 1859 1860 1861

several forms have also 1869

→ in the Longmynd beds, 1860 1861 1866

in the Longmynd beds 1859

OMIT 1869

→ zone. 1859 1860 1861 1866

zone in the Longmynd group, now divided into two stages, and constituting the Lower Cambrian system. 1869

↑ 1 blocks not present in 1859 1860 1861 1866 1872; present in 1869

Still more recently, the remarkable discovery has been made by Torell of the remains of monocoty-ledonous plants in a Swedish formation, corresponding with the Longmynd group; so that terrestrial or freshwater plants existed several great stages lower down in the series than has hitherto been supposed.

→ now within the last year the great discovery of the Eozoon in the Laurentian formation of Canada has been made; and after reading Dr. Carpenter's description of this remarkable fossil, it is impossible to feel any doubt regarding its organic nature. 1866

the difficulty of understanding the absence of vast piles of fossiliferous strata, which on my theory no doubt were somewhere accumulated before the Silurian epoch, is very great. 1859 1860 1861

→ comparatively 1866

as a comparatively 1869 1872

→ for its class is highly organised; 1866 1869

is highly organised for its class; 1872

→ and which 1866

about the vast periods which had probably elapsed before the Cambrian system, 1869

about the existence of living beings long before the Cambrian period, and which 1872

→ Notwithstanding these several facts, 1866

Nevertheless 1869

Nevertheless, 1872

→ beneath the Silurian formations 1866

beneath the Upper Cambrian formations 1869

OMIT 1872

~~the late~~

the late

E. Forbes ,

dispute

have disputed

disputed

this conclusion. We should not forget that only a small portion of the world is known with accuracy. →M. Barrande not long ago added another and lower

stage,

stage

→to the Silurian system, abounding with new and peculiar →species.

Traces

Remnants

of →several forms have been detected →in the Longmynd beds, beneath

Barrandes

Barrande's

so-called primordial →zone. ↑ The presence

also of

phosphatic nodules and bituminous matter in some of the lowest azoic rocks, probably indicates the former existence of life at these periods. But →now within the last year the great discovery of the Eozoon in the Laurentian formation of Canada has been made; and after reading Dr. Carpenter's description of this remarkable fossil, it is impossible to feel any doubt regarding its organic nature. There are three great series of strata beneath the Silurian system in Canada, in the lowest of which the Eozoon

was

found.

found;

~~and~~

and

Sir W. Logan states that their

united

"united

thickness may possibly far surpass that of all the succeeding rocks, from the base of the palæozoic series to the present time. We are thus carried back to a period so

~~far~~

far

remote, that the appearance of the so-called Primordial fauna (of Barrande) may by some be considered

→comparatively modern event." The Eozoon belongs to the most lowly organised of all classes of animals, but →for its class is highly organised; it existed in countless numbers, and, as Dr. Dawson has remarked, certainly preyed on other minute organic beings, which must have lived in great numbers. There is also reason to believe that at this enormously remote period plants of some kind existed. Thus the

words,

words

~~above given,~~

above given,

which I wrote in 1859, →and which are almost the same with those

since used

used

by Sir W.

Logan.

Logan,

~~have~~

have