THE GEOLOGIST. 
In the Devonian deposits .fhrougliout the world about one hundred 
and fifty species of fossil corals have been found, forty-nine of which 
occur in Devon and Cornwall. Twenty-three of these are found in 
continental Europe, and six in America ; five of the six are included 
in the European twenty-three, and one of the five has been met with 
in Australia. The British Devonian corals belong to twenty genera, 
six families, and the three sub -orders, Tioantliarla tabulata, Z.jperfoi'ata, 
and Z. rucjosa. 
The genus Favosites, belonging to Z. tabidata, contains five species, 
all of which have a wide geographical range. F. Goldfussii frequently 
attains a very large size ; masses upwards of two feet in diameter are 
sometimes met with. It is also remarkable for its great distribution 
in space, occuring in Devonshire, at Nehou and Vise in France, at 
at Millar in Spain, in the Oural, in the states of Ohio and Kentucky 
in America, and in New South Wales ; yet it was confined to the 
Devo"^iian era. It was formerly confounded with F. Gotlilanclica, a 
Silurian species. F. cervicornisis remarkable for its great abundance 
in certain localities : at East Ogwell, near Newton, a very consider- 
able mass of limestone seems to be entirely composed of it, to the 
almost total exclusion of other fossils. F. fibrosa occurs also in 
Lower Silurian rocks in South Wales, and in Upper Silurian in 
Shropshire. 
Fleurodictijum pi'ohlematicum is the only species, not only of the 
genus, but also of the family {Poritidce) , and even the sub-order 
{Zoantharia perforata) which occurs in Palaeozoic rocks, all its affinities 
are with organisms of much later times: it is a small islet of vitality, 
separated by a vast ocean of time from the organic continent to which 
it belongs. In Britain it occurs in the slate rocks at Meadfoot, near 
Torquay ; at Ogwell, near Newton ; and in great abundance, and of 
great size, at Looe in Cornwall; but has not been found anywhere in 
limestone. 
The genus Gyatliopliyllum, belonging to the palieozoic sub-order 
Z. rugosa, contains fourteen species, that is, two- sevenths of the 
entire series. A small reed-like variety of G. ccespitosum occurs in 
such numbers at one locality known as the Land's End, near Tor- 
quay, as to furnish a very faithful example of a coral-reef of the 
Devonian period. G. Buddandii is the only Biitish Devonian coral 
not found in South Devon. 
Ghonopliyllum perfoliatuni is recorded as occurring in Uppc- 
Silurian rocks as well as in Devonian ; its great vertical range sug- 
gests the belief that it possessed a hardy plastic constitution, seeing 
it had .lived through changes such as must have been introduced 
during lapses of time great as those represented by the terms 
" Silurian" and " Devonian ;" and from such a constitution it might 
be supposed to have had a wide geographical distribution ; never- 
theless, it seems to have been particularly limited in this latter 
respect, thus contrasting strongly with Favosites Goldfussii, which, as 
has been stated, circumnavigated the globe during the Devonian age, 
to which it was confined ; whilst Ghonophylhim perfoliatmn, whi?h 
