W. M. Hutchings—Altered Igneous Rocks, Tintagel. 101 
Kocene are on the more remote ancestral line. The nearest related 
European form is the Miocene Chalicotherium. No descendants of 
the Brontotheride are known. 
Menodus, Megacerops, Brontotherium, Symborodon, Menops, Titanops, 
and Allops, all belong to the family Brontotheride, and their relation 
to the genus here described, and to each other, will be fully dis- 
cussed in the monograph, to which reference has already been made. 
II].—Norres on Aurerep Jenzous Rocks or TrintaceL, Norra 
CornWaALL. 
By W. Maynarp Hurcutnes, Esq. 
(Continued from page 59.) 
OMING along the cliffs from Boscastle towards Tintagel, at the 
part just seawards of the village of Trevalga, and between the 
outlying rocks known as “Short Island ” and “Long Island,” we see 
one or two limited outcrops of a schistose rock different from the 
surrounding slates, shales, etc. A thoroughly good sight of it is not, 
however, obtained till we reach the extreme north side of Bossiney 
Cove, a little way south of Long Island, when a very fine exposure 
of the sheet in question is observed, lying in among the sedimentary 
rocks, sharply marked off from them at contact, so that the junction- 
lines can be seen distinctly even from some distance. 
It dips seawards in the cliff, and a very little way inland it rises 
to the surface and ends abruptly in an escarpment facing towards 
Trevalga. To the north, towards Boscastle, the sheet disappears and 
passes away under the quarries in the cliffs opposite the Growar 
rock. Going southwards it is not seen anywhere in the cliffs at the 
back of Bossiney Cove, which has been eroded through it; but at 
the south side of the Cove a section of it is again seen, similar to the 
one at the north side, the corresponding inland escarpment, on a 
larger scale, facing towards the village of Bossiney. The distance 
across the Cove in a straight line is nearly exactly a mile. 
Passing through the neck of land which separates Bossiney Cove 
from the little cove next following it, the sheet is again exposed 
along the shore, here dipping steeply into the sea. The configura- 
tion of the land does not here lead to the formation of a prominent 
escarpment looking inland, but a small outcrop is seen here and 
there towards the village of Trevena (or Tintagel as it is called). 
The sheet now disappears ;—the mass of sedimentary rocks in 
which are the slate-quarries on the church glebe, curving seawards, 
covers it up in the cliffs, and there is no valley or broken ground to 
cause an exposure of it inland. It is thus hidden for a distance of 
rather over a mile and a quarter. Supposing it to be continuous, it 
is again seen at the north end of Trebarwith Strand, where it rises 
from beneath the slate-quarries and continues along in one uninter- 
rupted exposure in the cliffs right away to the south end, a distance 
of three quarters of a mile. That what is seen at Trebarwith is 
really a direct continuation of what is seen at Bossiney Cove seems 
very little open to question. The direction of strike, position with 
regard to the slates, mode of occurrence, thickness and general 
