R. Etheridge, jun.— Carboniferous Tubicolar Annelida. 109 
[Norn 6.—A close fine-grained slate, which is seen with a pocket 
lens to consist of exceedingly small acicular crystals of hgrnblende, 
constituting a hornblende slate or what has been designated a schis- 
tose amphibolite. Examined in thin section the yellowish-green 
thin hornblende needles are seen to form the mass of the rock; they 
lie in closely aggregated parallel position with a small amount of 
interstitial quartz, which occasionally breaks into a crystalline nest. 
—T.D.] 
. In a direction south from this’ place a narrow strip only of the Pre- 
Cambrian rocks is found uncovered, extending chiefly along the lines 
of valleys. On the sides of which mountains of Cambrian conglome- 
rates and sandstones rise up, in some cases, as at Ben Alligin, to heights 
of over 3,000 feet. On the shores of Loch Torridon a very small 
area again remains uncovered. Where exposed, the rocks are of the 
types of the gneisses and schists already described. Many of them 
highly quartzose, but the felspar is more frequently here of a reddish 
colour than in those described about Gaerloch and Poolewe. The 
Cambrian sandstones [not generally here containing such large 
masses of rocks as at Gaerloch]| rest as nearly as possible in a hori- 
zontal position on the edges of the older rocks, and this horizontality 
of the beds continuing from mountain to mountain with highly 
precipitous cliffs is a marked feature as they stretch along the 
shores. No more remarkable geological scenery is scarcely to be 
found than is exhibited in the successive mountains of Torridon 
sandstone traced along the shores, and along the valleys leading to 
this Loch. The enormous destruction of the older rocks that must 
have taken place ere these mountains could have been built up, and 
the equally enormous denudation that must have subsequently taken 
place to have completely uncovered these older rocks again in so 
many areas and valleys, cannot fail to arouse some feelings of 
astonishment even in the geological mind. 
(To be continued in our next Number.) 
IV.—A Conrrisurion To THE Stupy or THE BririsH CARBONIFEROUS 
TuBICOLAR ANNELIDA.! 
By R. Eruerines, jun., F.G.S8., F.R.P.S. Edin. 
HE study of the Paleozoic Tubicolar Annelides has not received 
that amount of attention which the importance of the Order, 
either from’a geological or zoological point of view, appears to 
demand. True it is that many interesting and instructive papers 
and memoirs have from time to time, appeared, containing descrip- 
tions of species, and occasionally of genera; but, so far as I know, at 
any rate in this country, no connected account of either Silurian, 
Devonian, or Carboniferous Tubicolar Annelida has appeared. 
The present paper is an attempt to remedy this to a certain extent, 
in so far as our Carboniferous forms are concerned, although it in no 
way pretends to be either an exhaustive or satisfactory account, but 
merely a contribution towards that end. 
1 The Plate illustrating this paper will appear with a dater part,—Enpir, G. M. 
