44 Reports and Proceedings—Geological Society of London. 
fined to the Silurian limestone, and has been produced by the in- 
trusion of large bosses of granophyre (Macculloch’s “syenite’’) 
belonging to the younger, or Tertiary series of igneous rocks. 
8. “On the Discovery of Trilobites in the Upper Green (Cambrian) 
Slates of the Penrhyn Quarry, Bethesda, near Bangor, North Wales.” 
By Dr. Henry Woodward, F.R.S., V.P.G.S. 
The absence in Wales of organisms in the Longmynd and Harlech 
group renders any discovery of fossils in beds of this early horizon 
of the utmost importance. 
A portion of a Trilobite (Palzopyge Ramsayi) and Annelide 
burrows had already been found; but Dr. Hicks, at St. Davids, has 
added a sponge, 2 Ostracods, 6 Trilobites, 2 Lingulelle, and 2 Thece 
(Agnostus, Plutonia, Paradoxides, Conocoryphe Lyelli, C. bufo, and 
Microdiscus sculptus). 
Dr. Hicks has pointed out the singular absence of organic remains 
in the Longmynds both in Shropshire, N. Wales, and Treland, and 
has urged the need of further explorations. As if in answer to this, 
the author has received from Prof. Dobbie an impression and counter- 
part of a Trilobite from Bethesda, near Bangor, about 34 in. long and 
1# in. broad, also the head of a second specimen of the same species. 
These specimens were obtained from the Upper Green bed of the 
quarry, which immediately underlies the grits forming the brow of 
Bronllwyd and overlies the Purple Slate. The elabella i is marked by 
three oblique furrows on each side, the cheek-sutures are very obscure, 
and the eyes, which are minute (probably rudimentary), occupy the 
centre of the free cheek, the suture obliquely dividing the free cheek 
from the fixed. The outline of the head is rounded. There are 
fourteen free thoracic segments. The pygidium consists of about 
three coalesced somites. 
Comparing the Bangor fossil with Paradowzides, we find that 
Paradoxides has about twenty free segments. 
Asaphus, Ogygia, and Niobe have only eight thoracic rings, and 
the caudal shield is very large. 
Angelina agrees with the Bethesda specimen in the number of its 
free segments; but the glabella is smooth, the pleure are broader, 
and the cheek-spines very long. 
Olenus has fourteen rings ; the glabella is furrowed, but the head- 
shield is shorter and broader, and ‘the ends of the pleuree and margin 
of the caudal shield are usually produced into spines. Olenus is 
also smaller. 
Conocoryphe has fourteen free segments; the axis is parallel-sided, 
and does not diminish backward from the head to the pygidium ; 
each ring of the axis is notched on its posterior border, and the ends 
of the pleuree are rounded ; the glabella is furrowed obliquely ; the 
eyes are often wanting or are minute. 
From these considerations the author concludes the Bangor fossil 
to be referable to Conocoryphe, and to a new species, C. viola. 
The Trilobite was found by Robert E. Jones and Robert Lloyd, 
two quarrymen, at Bethesda. Afterwards Prof. Dobbie found a 
detached head of the same species near the spot where the original 
