File:The Quarterly journal of the Geological Society of London (13935590811).jpg

486 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. .May 9,
Along the lines of these newer faults the most important of the
English lakes occur ; and they give to the Lake-country its bolder
features.
Some lakes, however, such as Hawswater and Wastwater, which
have a north-east and south-west course, occupy valleys which
appertain to the older system of faults. In the case of UUswater
we have a more complex outline than usually belongs to the lakes
of the north of England. The first and lowest reach of the lake has
a north-east and south-west direction. At the south-west end of
this reach Hallan Crag presents a bold front, which results in part
from a fault running north and south, and crossing UUswater from
the valley near Howtown. The middle reach of the lake commences
on the west side of the north and south fault ; it also has a nearly
north-east and south-west direction, and terminates abruptly near the
north-western spur of Place Eell : the middle reach seems also to
occupy a valley produced by a fault belonging to the older system.
The upper reach runs nearly north and south. It occurs in a
valley produced by one of the newer faults, which, crossing Eirkstone
Pass, continues southward through Trout Beck ; and it is to one or the
other of these two systems of faults, or to their combined influence,
that the beauty of the Lake-country chiefly owes its origin.
Note on Two new Species of Trilobites.
By J. W. Salter, Esq., E.G.S.
1. Phacops Nicholsoni, spec. nov. Figs, c & d.
There is too little of this species to enable me to give a proper
diagnosis. It is evidently a species of the subgenus Acaste, and not
distantly allied to P. Brongniartii,
a fossil from the Caradoc or Bala
rocks of Tyrone. I have two spe-
cimens — one found by Professor
Harkness, from which the figure is
taken; another, smaller, is in the
cabinet of Mr. H. Wyatt Edgell.
Each shows something the other
does not possess, and I shall de-
scribe them together, as the figure is a sketch made up from both
specimens.
The whole form is broadly oval, much depressed, about half an inch
wide, and about 1 inch long ; the head is semicircular, rather pointed
in front, three-tenths of an inch long, and more than half an inch
wide.
The glabella is trapezoidal, the sides are nearly straight and widely
diverging from the base, which is only half as wide as the forehead-
lobe. This is transverse, diamond-shaped, bluntly pointed, and
angular in front, and divided from the three lateral lobes by a slightly